I frequently do an exercise where I draw 3 randomly-placed lines and try to make an image out of them. This is a 3-line drawing that ended up being a strange squawking bird. It's drawn with brush pen and colored with Prismacolor markers on 11 x 14 paper. It was drawn in front of humans at Dick Blick Art Supply in LA in 2011.
This is currently for sale in my Etsy shop! [link]