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I came across this chromatic typewriter on StumbleUpon and thought it was a good idea.
The story behind it is the painter Tyree Callahan modified a 1937 typewriter and replaced the letter keys with colour pads. The result is that when you type you create your own colour painting.
I think this was an idea for some kind of competition and probably this won`t be sold anywhere, but I still thought it was a good idea, especially for people like me who cannot be creative with painting hehe
Pictures are not mine and are credited in the source link.