I really appreciate objects (and people) whose specialty doesn’t present immediately. The Invisible Chair is made that way. Its design is simple and unassertive; its construction is sturdy. There’s a kind of invisibility in passing for an ordinary domestic object. But when someone taps the seat with a knuckle or starts in with the mallets, the chair turns into something to look at and listen to all at once. It also helps folks be a little more suspicious of ordinary things.