TimeWriter, printer for graffitti

Interesting project, its like a homemade giant inkject that you can walk along a wall and “print” out a message.  Guy uses paint that will dissolve in rain.  Also using an arduino to controll the whole thing.  Not much info on how this is built.  Reminds me of another arduino project called InkShield from a few years back.

http://oliviervanherpt.nl/time-writer/