Karen X. Cheng and Ross Ching are having some fun with gravity and camera angles in this video that's been making the rounds on Reddit and local blogs. In the past, Cheng has collaborated on that Superheroes dangling from buildings photo shoot. She's also learned to dance in a year, a process she time-lapsed to much press. Her current job or at least one of them, judging from her site, includes "viral video consulting." Here's some of that at work.

Previously: Video: Daring Photo Shoot Dangles Superheroes From SF Skyscraper