A pencil and paper is all it takes. Most people pack a sketchbook, but even that is not necessary: one urban sketcher, Julio Brenes, uses disposable paper coffee cups as his canvas. “Urban sketching ...

"I love it. It's my favorite thing to do," Goldenberg said. This type of flash mob with pencils is called "urban sketching." It's a global movement turning sidewalks into studios, parks into popup ...