One more from mathematical madman maker John Edmark, this one on the furniture front. Practical? No; but his Four-Legged Chair has to be the most creative two-person bench I've ever seen:
Six simple pieces of wood. But you just know that if a design student came up with this and presented it at crit, their accompanying thesis would weigh more than the piece itself and be filled with heavy-handed metaphors: "We ARE our furniture," "We SUPPORT each other," "We INTERACT with furniture when we truly FACE each other," et cetera.