"The viewer walks around the figures and gets all these different perspectives as the surfaces change. That's one way the distortions are interesting, because no two perspectives are the same. A lot of people see them and think they're flat, then realize they're objects—that's a hard thing for the brain to process immediately. But it's not just retinal, it's also physiological: There's a queasiness, an anxiety caused by the brain not being able to understand the two things at once."

Here is a video and interview with the curator of the Lever House.