a kinder, gentler grafitti

The Thank You Guy cracks me up. I see his work in the Greenpoint station on the G. On the peeled up paper ads, on the stairs going up on the Queens-bound side, and on the Robert Motherwell-esque mysterious painted black squares. I am pretty sure he works in chalk, but my museum manners prevent me from testing the surface. I tried and tried to take a picture without the flash if you can believe it