'Rage is Back' author Adam Mansbach on NYC graffiti

The author of the bestseller "Go the F--- to Sleep" has returned with his new novel "Rage Is Back," the story of a renowned NYC graffiti artist who disappeared after a feud with the police, then returns 16 years later. Through gripping prose, Adam Mansbach puts the reader in the thick of the graffiti underground.

Mansbach says that everywhere you look in New York City, there's a story to tell about graffiti. Here are four stories, as told by Mansbach.