You don’t usually find people hanging off of buildings in D.C., and when you do, it’s because they’re cleaning windows or about to cause a lot of security-minded folks a serious headache.

But on Friday night Project Bandaloop brought its “perspective-bending dance” to the walls of the Old Post Office along Pennsylvania Avenue for “Bound(less),” a performance that capped off the week-long “Look Both Ways: Street Arts Across America” festival sponsored by the Kennedy Center.

For a bit of perspective, consider this—the Old Post Office tower, where the dancers performed, is 270 feet above street level.