CHE-YU WU / STRATA 地層

Strata | 2001–2026: what each year left behind

The school years in the making

Animation, music and code meet on one wall. Follow a documented connection, or begin with a single piece of paper.

2013-09-09 — 2016-12-31
37 public records

Read the year downwards, one month at a time. The small tags under a card are its connections: open one to jump to the record it names.

2013 · 09

2013 · 10

2013 · 11

2014 · 01

2014 · 02

2014 · 05

2014 · 07

2014 · 09

2014 · 11

2014 · 12

2015 · 03

2015 · 05

2015 · 09

2015 · 11

2015 · 12

2016 · all year

2016 · 03

2016 · 04

2016 · 05

2016 · 06

2016 · 07

2016 · 09

2016 · 10

2016 · 11

Family treeHow 818 daily sketches grew out of one another46 families drawn as branching trees with thumbnails, 2018 to 2026

Complete records

Read each record

Newest first, older as you go down. Each record retains its date basis, public sources and connection labels.

zashare_website — the ZaShare site — project image
Open sourceMonoame Design / portfolio image

· Published Taken from the repository creation date on GitHub; the work itself may have started earlier.

zashare_website — the ZaShare site

A public repository whose description and README both read simply as the ZaShare site. Its main language is listed as JavaScript and the last push falls on the day it was created. ZaShare recurs as a client through this period, and its data appears as the sample set in one of the streams.

  • ZaShare
  • Commission
Hahow course cover: Animated Interactive Web Programming
CourseChe-Yu Wu / Hahow course cover

· Published The update log on the course page gives only month and day. The year is inferred from the same log's note that crowdfunding closed on 7/4 and from the Hahow public API, which records the funding deadline as 3 July 2016 and publication as 1 September 2016.

Hahow course one — a live student work collector goes up

The update log on the Hahow course page for the first course records that a live student work collector was added on 7 November, with more than a hundred pieces of student work and practice already submitted, and that 85 units totalling 1,230 minutes were online before 15 November. This homework site is the custom collection mechanism later described in press coverage.

  • Course operations
  • Student work
The 22nd Citibank United Way campaign site — project image
Open sourceChe-Yu Wu / GitHub README image

· Published Taken from the repository creation date on GitHub; the work itself may have started earlier.

The 22nd Citibank United Way campaign site

A public repository whose README names it the 22nd Citibank United Way campaign site and quotes the campaign copy about United Way and Citibank gathering sparks of giving over many years. The README links a CodePen version and the campaign address citi2016.unitedway.org.tw.

  • Campaign site
  • Commission
Open source

· Published Taken from the repository creation date on GitHub; the work itself may have started earlier.

Organic-Alpha — a PHP dataflow scripting library across front and back

A public repository described as a functional scripting library with a PHP dataflow that combines front end and back end. The repository carries only that single line in its README, with no further documentation.

  • PHP
  • Dataflow
Open source

· Published Taken from the repository creation date on GitHub; the work itself may have started earlier.

Animated-Web-Course — tooling for the interactive web course

The repository description reads as the interactive web programming course. Its README documents a parse_codepen API that pulls the og image and title text from CodePen, taking an array of addresses and returning the page metadata while caching what it has already parsed. The API sits under the awi_class path on monoame.com, the back end of the student gallery.

  • Course tooling
  • CodePen
Hahow course cover: Animated Interactive Web Programming
CourseChe-Yu Wu / Hahow course cover

· Published Taken from the API's publishTime.

Animated Interactive Web Programming goes live

The publishTime in the Hahow public API is 1 September 2016, the planned start date. The course went on to become the largest of his three Hahow courses; in 2026 its page shows more than thirteen thousand purchases. The live work collector and the completion of all units belong to the 2016–2017 wall.

  • Online course
  • Teaching
Abstract music visualisation — work page image
PrototypeChe-Yu Wu

· Published Taken from the start of the span printed on the work page.

Abstract: a computational visual identity from a short course at University of the Arts London

The work page gives the span as July to August 2016 and says the piece was completed during a short course at University of the Arts London. The brief was to visualise a given piece of music; he turned it into particles with web effects, added trajectories with gravity, repulsion and mouse interaction, so that each playback produces a unique visual identity. He calls it one of his favourite works. The “other works” list on his Hahow course page also names Abstract, music turned into visual form; the page was archived in March 2017 with a CodePen title still on it.

  • Music visualisation
  • Particles
The syllabus and the examples, all written on CodePen — course image
CourseMonoame Design / portfolio image

· Published Taken from the creation time of the syllabus pen (UTC).

The syllabus and the examples, all written on CodePen

The syllabus of the first course is itself a pen: “Animated Interactive Web Programming — syllabus”, created on 30 June 2016, sat on the course page during the campaign and has been viewed tens of thousands of times. Through August, before the course opened, the examples appeared one by one: Project1 on 30 August, Demo2-5 on the 27th, Animated Web Design Example 1 on the 15th, the last carrying his own line: Che-Yu Wu, Monoame Design, from graphic design and animation to front- and back-end web work. The assignment links in the course page's unit list point at these pens.

  • CodePen
  • Course material
Poems at Will, no. 1, Anxiety: a poem turned into an interactive page — project image
PrototypeMonoame Design / portfolio image

· Published Taken from the archive date; the page itself carries no date.

Poems at Will, no. 1, Anxiety: a poem turned into an interactive page

A June 2016 archive of monoame.com/poem/1/, titled “Poems at Will, no. 1, Anxiety”. The poem begins “anxiety is a clock with sixty second hands”, credited to the poet Mo Jin with interactive visuals by Monoame Design. The “other works” list on his Hahow course page calls it poem visualisation. It is among his earliest attempts at turning text into an interactive image, before the sketches and daily works on this site.

  • Interactive visuals
  • Poetry
Hahow course cover: Animated Interactive Web Programming
CourseChe-Yu Wu / Hahow course cover

· Published Taken from the API's proposalStartTime; the same record's createdAt is 10 October 2015, when the course proposal was created.

Hahow course one goes to crowdfunding

The Hahow public API records the crowdfunding window of Animated Interactive Web Programming (HTML/CSS/JS) as 3 June to 3 July 2016, with a threshold of fifty backers; the update log on the course page notes on 7/4 that the campaign closed successfully. The course is pitched at designers and people with no programming background: write in Codepen and see the result at once, from page elements and Sass to Vue.js and an interactive piano. He was an electrical engineering undergraduate at the time.

  • Online course
  • Crowdfunding
Complex Festival 2016: speaker number 28, “#Monoame Design, Che-Yu Wu” — event image
Talkcomplexfestival.info / page image

· Past event record Taken from the event date printed on the site, 28 May; the archive is from the following day.

Complex Festival 2016: speaker number 28, “#Monoame Design, Che-Yu Wu”

An archive of complexfestival.info records the Complex Festival of 28 May with thirty-two selected speakers, number 28 being “#Monoame Design, Che-Yu Wu”. His own blurb: a third-year NCTU student who has played with everything since childhood, from animation onward; at university he ran the piano club and founded the student union's marketing department, built a giant Christmas tree, then declared the fireworks over and started again as Monoame Design. He built the site as well: the pen “Complex Festival” on his CodePen dates from 11 May.

  • Talks
  • Monoame Design
Prototype

· Published Taken from the creation time of the “tedcss” pen on CodePen (UTC); the site was archived on 27 June.

TEDxHsinchu 2016: head of the information team, and the event site

An archive of the TEDxHsinchu 2016 site lists him in the team as head of the information department, next to Kuo Yi-ching, later the person who filmed the NCTU Christmas Festival opening, as head of design; the theme was “HSINCHU × 2016 × BIG VISION”. A pen named “tedcss” on his CodePen, created on 13 May 2016, holds the site's styles.

  • TEDx
  • Website
Dyverse Studio: a website for a music studio — project image
PrototypeMonoame Design / portfolio image

· Published Taken from the creation time of the “Dyverse Studio Index” pen on CodePen (UTC).

Dyverse Studio: a website for a music studio

An August 2016 archive of the site, titled Dyverse Studio, says the studio was founded in 2016 with a mix of musical styles; his e-mail address sits in the page source. The pen “Dyverse Studio Index” on his CodePen was created on 7 May 2016, with a March version, “DYVERGE STUDIO”, and a July one, “Dyverse Studio 0719”, beside it. The “other works” list on his Hahow course page includes the studio, and the site is still online.

  • Website
  • Music studio
The new website of Shyang-Horng AutoCAD Training Center — project image
PrototypeMonoame Design / portfolio image

· Published Taken from the creation time of the “Shyang-Horng new site” pen on CodePen (UTC).

The new website of Shyang-Horng AutoCAD Training Center

Shyang-Horng is his father's AutoCAD training company; the CV on this site records drafting and AutoLISP work there from May 2014 to June 2016, and the biography on his Hahow course page lists its website and management system. The pen “Shyang-Horng new site” on his CodePen was created on 16 April 2016 and “Shyang-Horng back end” on 19 May; in an August 2016 archive every image on www.autocad.tw is served from monoame.com. The site is still online.

  • Website
  • Shyang-Horng
The Jiao-Jiao AED system architecture diagram: an embedded system, a NodeJS server, the 1999 hotline and the caller's phone
AwardChe-Yu Wu / diagram, 2016-03-13

· Past event record Taken from the competition date; the ceremony was on 25 March. The team name was confirmed by him on 18 September 2026. He confirmed the proposal name, Jiao-Jiao AED, on 1 October 2026.

Smart City Hackathon, makers' jury grand prize: team Noise Airdrop

The Smart City Hackathon, run by the Industrial Development Bureau of the Ministry of Economic Affairs, was held on 12 and 13 March 2016 at the TAF Innovation Base, with 454 participants in 105 teams and prizes presented on 25 March alongside the Smart City Expo. The official winners list gives the makers' jury grand prize of NT$500,000 to entry 49, Noise Airdrop, which was his team; the CV on this site records first prize and the jury grand prize at this first edition, and the biography on his Hahow course page calls it the jury's super grand prize. The list names teams only; the link between the team and him is his own word. The winning proposal was Jiao-Jiao AED: a networked device beside an ordinary AED, so that someone calling 111 can be located and pointed to the nearest machine.

  • Hackathon
  • Smart city
Talk

· Artist record Taken from the year on the CV; no month or day is recorded.

Self-taught Night: a journey of learning graphic design alone

The earliest talk on the CV on this site: Self-taught Night in 2016, on his journey of learning graphic design on his own. No event page or recording survives, only the line on the CV.

  • Talks
  • Self-taught
The Kaobei NCTU 2.0 interface — YouTube video thumbnail
PrototypeChe-Yu Wu / YouTube

· Published Taken from the upload date.

Kaobei NCTU 2.0: a new front end for the anonymous message board

A twelve-second video titled only “fbbb”: the browser shows “Kaobei NCTU 2.0”, an illustration of someone at a laptop above a posting box. A June 2016 archive keeps the page's own words: “what do you want to complain about? send · Kaobei NCTU v2.0”. The “other works” list on his Hahow course page includes it. Kaobei NCTU is the anonymous message board of NCTU students; this was his new interface for it.

  • Web
  • NCTU
monoame.com: the first website of Monoame Design — project image
PrototypeMonoame Design / portfolio image

· Published Taken from the archive date; the site itself went up earlier.

monoame.com: the first website of Monoame Design

The Internet Archive's snapshot of 19 November 2015 is the earliest Monoame Design site that can still be found: the works page lists a single piece, Hummi Bird, under the slogan “Design your life, Design what Inspire your sight.”, and the about page describes a studio working across graphic, identity and web design. A pen on his CodePen titled “Monoame Index Old 2015”, created in March 2016, holds the source of that home page. The CV on this site dates the founding of Monoame to 2014.

  • Monoame Design
  • Website
Forgotten Blue: white waves on blue — YouTube video thumbnail
MusicChe-Yu Wu / YouTube

· Published Taken from the upload date.

Forgotten Blue

A piece of just over two minutes. The description is a short poem: memories are salty like sea wind, some are islands slowly swallowed by the waves of a blue sea. The frame is an island made of white waves on blue.

  • Original
  • Music
NCTU EE Night: projected title and the little robots — YouTube video thumbnail
PrototypeChe-Yu Wu / YouTube

· Published Taken from the upload date; the event was on 17 May.

NCTU EE Night: testing the little robot installation

A forty-seven-second test video: the words “5/17 NCTU EE Night” projected on a wall beside two small yellow block robots. No further description; an installation for the electrical engineering department's evening event in May 2015.

  • Installation
  • NCTU
Selinko × Rémy Martin app interface — work page image
PrototypeChe-Yu Wu

· Published Taken from the start of the span printed on the work page. Neither the press release nor the film credits him; the work page is what ties him to the project.

Selinko × Rémy Martin: the app interface for an NFC-verified bottle

The work page gives the span as March to May 2015, with the Belgian start-up Selinko and Rémy Martin as clients. It describes a campaign app for the Chinese market: with counterfeit spirits common, Selinko put an NFC chip in the cap that is destroyed on opening, so a scan shows whether a bottle has been reused. He proposed extending Rémy Martin's identity, presented a mood board for the interface's motion concept, and delivered a minimal, modern interface; the other task was a 3D model and animation of the bottle that the client wanted as close to the real one as possible. Selinko's press release of 1 July 2015 announced the Rémy Martin Centaur Connected app; the campaign film embedded on the work page was uploaded to Vimeo by the production company Ouat.

  • UI design
  • 3D
To You in My Memory: a figure on an autumn path — YouTube video thumbnail
MusicChe-Yu Wu / YouTube

· Published Taken from the upload date.

To You in My Memory: arrangement, narration and editing

The description credits the song and vocals to Chou Yu-hsi and the arrangement, narration and editing to Che-Yu Wu, and prints the full lyric. The frame shows a figure on a forest path in autumn with the title set in the middle. A two-and-a-half-minute music video; his part was the arrangement and the picture.

  • Arrangement
  • Music video
NCTU Christmas Festival: the tree lit up at night — YouTube video thumbnail
ExhibitionChe-Yu Wu / YouTube

· Published Taken from the test video's upload date; the lighting ceremony was on 24 December and the Apple Daily item ran on the 22nd.

NCTU Christmas Festival “Dance of Light”: a Christmas tree that flashes to the music

The description calls this the second stage of the student union marketing department's Project Smile: music and lights arranged together so that people crossing campus would slow down. The work page says he led six people from the department, bought Arduino boards, replaced the light strings' control boxes with a board of their own, choreographed seven layers of lights to a piece of music, and drew more than five hundred students to a show in front of the library on Christmas Eve. An Apple Daily item on 22 December reports commenters calling it “a tech nerd's idea of romance” and notes the 4.5-metre tree came from the department head. The test video has passed thirty-seven thousand views.

  • Arduino
  • NCTU
The deck's title page: large type for “design” and “deep journey”, with the speaker named as the student union's head of marketing, Che-Yu Wu
TalkChe-Yu Wu / slide 1, 2014-11

· Artist record Taken from the lecture date on the poster and in the deck's file name, 30 November 2014.

Design lecture “A Travel to the Design World '14”: a 39-page deck by the student union's head of marketing

At 6:10 pm on 30 November 2014, in the Heqin Auditorium (合勤講堂) at Engineering Building 4, basement 1, the poster names the student union's head of marketing, Che-Yu Wu, as the speaker. The 39-page deck starts with his own work: the Acer Digital Creation Awards 2008 to 2012, the Blackboard War, illustration, 3D design (elevators, medical, factory), effects for Sun Color, and web design. It then uses the student union graphic design he had done since July 2014 to talk about design attitude, the 10,000-hour rule, observing life and connection. The programme was the role of design, Photoshop basics, Photoshop in practice and open exchange.

  • Design lecture
  • Student union
  • Slide deck
Taipei International Cosmetics Expo website — work page image
PrototypeChe-Yu Wu

· Published Taken from the start of the span printed on the work page.

Taipei International Cosmetics Expo: two years of website, ticketing and membership system

The work page gives the span as September 2014 to September 2015, with the United Daily News as the client. It describes Taiwan's largest cosmetics fair: he designed the website, built a ticketing system, and reworked the visual identity and site four times in a year, bringing the look of international beauty brands into a conservative trade show. He ran the site two years in a row and later built a membership system that issued free tickets against ID, tracked visiting habits and handled admission checks for about twenty thousand visitors. A November 2015 archive of the monoame.com home page is in fact a staging copy of the 25th Taipei International Cosmetics Expo site, with “site design and development: Monoame Design” in the footer.

  • Website
  • Commission
A photograph of the new-student pack box: a dark box with the student union crest, captioned NCTU student union new-student pack, 1,317 already sent
PrototypeChe-Yu Wu / design, 2014-08

· Artist record Taken from the start he gives in his deck, “graphic design 2014.7-Now”. The file-name dates of the pieces shown run from 26 June to 10 November, and the earliest in the archive is 13 May.

Graphic design for the student union and clubs: posters, a new-student pack and a business card, 2014

The 2TB drive's “作品集.rar” holds 45 JPG files and most of their PSDs, with file names that start with a date, running from 13 May to 23 November 2014. His lecture deck labels this stretch “graphic design 2014.7-Now”, and the posters often carry the logo of the student union's marketing department in a corner. Fourteen pieces are shown: the student union logo competition and vote, the notices for the dormitory 13 water and power cut and the Qixi blackout, the new-student pack (its box photograph reads 1,317 already sent) with two comics, the university president selection survey, a secondhand book sale by the electrical engineering department, a Photoshop workshop, a joint Christmas dance, and a piano club president's business card.

  • Graphic design
  • Student union
  • Posters
A red gift box with the word Surprise and a Chinese line about giving people around you a surprise that breaks reality
TalkChe-Yu Wu / slide 5, 2014-05

· Artist record Taken from the date in the file name and on the poster, 15 May 2014.

NCTU Hip-hop Research Club briefing deck: a canteen flash-rhythm, a stress-source game, LightMare, Sensing Umbrella

The deck is named 20140515 sharing deck, and its poster announces a members' meeting and briefing at 7 pm on Thursday 15 May 2014 in Engineering Building 4, room 203. Its 30 pages start with the ideas: For Fun, Share Joys, Surprise, Social, Utopia, then propose four experiments: a flash-rhythm in the canteen, a motion game for hitting stress sources, NCTU LightMare and Sensing Umbrella. The last three pages are questions and answers, including how to join.

  • Interactive installation
  • Student club
  • Slide deck
Hand-lettered title over orange and purple bokeh circles
PrototypeChe-Yu Wu / frame from the 2014-05 cut

· Artist record Taken from the file time of the version containing this title, LightDark.mp4, 19 May 2014. The lecture deck gives the whole engagement as July 2013 to October 2014.

Effects for three Sun Color books: the title sequence of the book on medicine's brightest and darkest scene

His November 2014 design talk lists “Sun Color Culture, effects, 2013.7–2014.10”. The drives hold three book-promotion video folders, named for storytelling, for medicine's brightest and darkest scenes, and for Lin Chiu-li, with Premiere and After Effects projects and every exported version. The films are mostly interviews and location footage, so the archive page shows only the title sequence he made: the handwritten book title fading in over bokeh, which after about nine seconds breaks into scattering red dots.

  • Visual effects
  • Title sequence
  • Commission
3D render of the heated fractionating barrel, tubular preheater and panel condenser, labelled in Chinese and English
PrototypeChe-Yu Wu / render, 2014-02

· Artist record Taken from the date in the folder name, 20140207. The renders are dated 11 to 26 February and the process animation video 19 March.

Chemical plant 3D animation: a process film for GL Renewable Energy

A 3D animation of a chemical plant made for Gaolin Renewable Energy in February 2014, in the second term of his first university year. The 3ds Max renders break the process into a tube preheater, a plate condenser, a cooling loop, a fractionation drum and a receiving tank, with labels in Chinese and English and flow marked a to i. On 19 March he exported a process animation built in Flash, whose title card reads “Gaolin Renewable Energy Co., Ltd. process flow”.

  • 3D animation
  • Industrial process
  • Commission
A blue camera icon above the words “Photographer?”
TalkChe-Yu Wu / slide 1, 2014-01

· Artist record Taken from the modification time of the deck, 26 January 2014. The folder name says 20140127Sharing, a day later.

A sharing deck from January 2014: two dreams, For Fun to Utopia

A 19-page deck saved on 26 January 2014. Page one asks “Photographer?”, page five, “What did I do”, lists his results at the Acer Digital Creation Awards, and page six weighs two dreams on a scale, one marked $ and one marked ★. The second half gives one word per page: For Fun, Share Joys, Surprise, Conbine, Reconstruct, Timing, Conclude, Social, Utopia, and the last page reads “The End And it's NOT The End”. The same folder holds three earlier films, which are not shown here.

  • Slide deck
  • Sharing
Concert trailer title frame — YouTube video thumbnail
PrototypeChe-Yu Wu / YouTube

· Published Taken from the upload date; the concert was on 30 November.

Trailer for Chen Chi-chang's 25th anniversary harmonica concert

A short motion piece whose description gives the date, Saturday 30 November at 6:30pm, free admission, at the KHS concert hall in Luzhou. The frame is a gold calligraphic character with the concert's title. After three years in the Jianguo harmonica club, this was a trailer he made for a harmonica player's anniversary concert.

  • Motion graphics
  • Harmonica
Joker: a jester on a ball under a spotlight — YouTube video thumbnail
MusicChe-Yu Wu / YouTube

· Published Taken from the upload date; the description dates the piece two days earlier.

Joker: a piece written in November 2013

The description reads only “written 5 November 2013”. Eighty seconds long; the frame shows a jester's silhouette balanced on a ball under a spotlight, ringed by dark figures. A piece from the first term of his first year.

  • Arrangement
  • Original
UDN TV, Press Like for Yourself, episode one: digital creation with Che-Yu Wu and Lin Tzu-chun — video still
Interview為自己按讚 / YouTube thumbnail

· Published Taken from the upload date; the broadcast date is not given in the description.

UDN TV, Press Like for Yourself, episode one: digital creation with Che-Yu Wu and Lin Tzu-chun

The udn.tv programme Press Like for Yourself, whose first episode on digital creation interviewed Che-Yu Wu and Lin Tzu-chun. The twenty-five-minute episode was uploaded by the programme's own channel with a one-line description. He was a month into university; the conversation is about the prize-winning digital work of his school years. The CV on this site lists the episode among his press.

  • Television
  • Interview
A frame from the animation: a red lymph node with fine lymph vessels
PrototypeChe-Yu Wu / animation frame, 2013

· Artist record Taken from the file time of the last version, VGLN_7.mp4, 10 October 2013. The earliest files in the folder, hand.rar on 28 August and hand.avi on 29 August, predate this wall's start on 9 September, so the record sits on the last version.

Lymphedema treatment animation: a 3D medical film for Chang Gung Hospital

A 3D medical animation made for Chang Gung Memorial Hospital in the autumn of 2013; the end credit reads “Animation: Wu Che Yu”. The 64-second final version runs through designing a 10 × 5 cm flap, the incision, the transfer to the wrist, joining the vessels, the lymph node taking up lymph, and finally the effect of gravity. The work ran from 28 August to 10 October and left 17 renders and 7 versions. The archive page shows 34 seconds of it without sound.

  • 3D animation
  • Medical
  • Commission
Motion-sensing mouse test: code beside a depth image — YouTube video thumbnail
PrototypeChe-Yu Wu / YouTube

· Published Taken from the upload date.

A simple motion-sensing mouse: driving the cursor with a depth camera

A one-minute screen recording with code on the left and a grey depth-camera silhouette on the right, titled “writing a simple motion-sensing mouse”. No further description; an input test made with a Kinect-type depth camera in the autumn of his first year.

  • Motion sensing
  • Kinect
A speech recognition demo: a chat window in the browser — YouTube video thumbnail
PrototypeChe-Yu Wu / YouTube

· Published Taken from the upload date.

A cute interface for the speech recognition API

A screen recording of just over a minute, titled “a cute interface for the speech recognition API XDDD”: an anime-style chat window in the browser that turns speech into text. A small experiment from the autumn of his first university year, with no further description.

  • Web experiment
  • Speech
A Logic window screenshot with tracks Bluebird drums, Unplugged Bass, Grand Piano and Pad, Medieval Lute and Church Choir
MusicChe-Yu Wu / Logic window capture, 2013-08-29

· Artist record Taken from the first date-named project after term began, 20130911, file time 11 September 2013. The earliest project, Omni Night Sky, is dated 29 August 2013, 11 days before this wall's start on 9 September, and the audio preview comes from it.

Logic sketches from autumn 2013 to early 2014: project files and one preview

Pieces made in Logic in his first term at university. The 22 projects run from 29 August 2013 to 16 January 2014 and none was exported as a finished track; the only thing that plays is an 81-second preview Logic saved inside Omni Night Sky. The other projects keep window captures that show the sounds he tried: bells, harp, marimba, grand piano, harpsichord, flute and guzheng.

  • Logic
  • Composition
  • Sketches