Yes, that is a school bus teetering on a ten-story building in downtown St. Louis. But don’t worry, it won’t collide with the airplane lodged in an oversized slinky strung into the next building; it would hit the world’s largest pencil before doing that. Once a shoe factory in downtown, the extraordinary mind of artist Bob Cassilly created an innovative, creative, and fun place from all sorts of recycled objects. Crawl inside a dinosaur, swing from a trapeze, slide down a shark’s tooth — nothing here is breakable. Everything is to be touched, punched, pulled and pounded on. Older kids or adults may enjoy seeing a portion of the real building that inspired the best-selling book and movie “The Exorcist.”