Illusions

Imagine walking down the street and seeing a bottomless crevasse right there in front of you.  You stop because you probably don't want to spend the rest of your life falling into a hole, but the guy next to you just keeps walking.  Not only does he not fall, he walks right over the hole and laughs at you for being fooled.  That's exactly what happens on a daily basis at Sergals Torg in Stockholm.