It's http://whatcolourisit.scn9a.org/ but as a Mac screensaver
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A Mac screensaver of this website: http://whatcolourisit.scn9a.org/
Original idea and website by J.E.Murphy
Screensaver by Jonic Linley
This was built on Yosemite and has been confirmed as working on El Capitan - no guarantees it will work on your Mac! If it doesn't, then there's the source code so you can fix it!