I'm not entirely clear on how Studio Intussen's "PixelTable" works -- the outer layer of square bamboo pieces appears to be permanently affixed, while the interior rows simply rest on one another. When you insert an object into one side, it pushes out the wooden pieces on the other side, making little table-like extrusions. I can't decide if this would be an endlessly delightful fidget-object, or instantly tedious.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.