When Valve announced its Steam Box in January at CES, we saw what was supposed to be a prototype of the console. Produced by Xi3, the little box shown was a very small form-factor PC, able to fit in the palm of your hand. Xi3 recently opened up pre-orders for that box, dubbed the Piston, but also stated it's not a Steam Box. Hypothetically speaking, though, no one has any idea what constitutes a Steam Box.