happy?

I ride the train every tuesday and thursday, i usually listen to my ipod, check my emails, or sketch a little bit. but i also like analyze other people out, most of the times i see long and sad faces, i don't blame them, there are many things to be sad and worried about, but at the same time there are more to be happy and excited about. so i decided to place a happy face sign next to the prohibited signs, a sign to invite and remind people to smile!