According to wikipedia, color blindness occurs in about 8% of men. Contrary to the popular conception, it does not mean that a man sees gray, but rather that he can’t tell the difference between some colors (most commonly red and green).
What does the world look like with this condition? Paul Martin at critiquewall.com has posted an article showing some photoshopped images of vision through color blindness.
chrisyates.net has produced a map of the US highway system rendered in the style of the London tube map.
While normally people wanting to visualize ‘how humans feel on the web’ would be a little too hippie for me, this Jonathan Harris talk at TED makes it useful. Not only does he talk about what can be done, but he’s built two examples himself, the Universe and We Feel Fine. Beware: this way lies procrastination.
ChemicalBurn is a hypnotic screensaver for OS X, written by Michael Ash, that simulates a self-optimizing network. It randomly lays out nodes on the screen then has each attempt to route packages to the others. The more frequently routes are used by packages, the faster the connection becomes.
I lost several hours yesterday tweaking the various settings and seeing how they affected the network — if you want to procrastinate yourself into a trance, this is an excellent way to do it.