What's up with the pink people sitting on a rooftop, wedged between buildings, peering into a window and hiding around other Boston landmarks?

WELL, A FEW PEOPLE HAVE MET HIM, BUT MORE THAN 13,000 PEOPLE FOLLOW HIM. THEY COULD SPOT HIS ARTWORK MILES AWAY, AND THEY GO MILES JUST FOR A CHANCE TO GET THEIR HANDS ON A SKETCH. KMBC NINE S ...