Two dudes make a 200 square foot mural of Calvin and Hobbes using Post-it notes! David says,"We started with a Microsoft Paint file that was 32 pixels tall and 100 pixels wide. Each pixel in the Paint image represented a note. When we had an image we were pleased with, we counted up the numbers for the different colors and ordered the correct amount of each. Finally we copied the image over into MS Excel so we'd have a grid reference to help us avoid mistakes."