san francisco: make your way through the city and up the hills to 18th and missouri in potrero hill. take a moment to consider the long wooden fence painted in vibrant greens with splashes of bright color and note the multiple "eyes" staring at you from every direction. spend some time grouping the eyes together to form little characters and faces - but don't linger too long, someone may get suspicious, creeped out, or think you're just weird.