Ray nodded solemnly. "Paradox bites like nobody's business," he said, and fished his mechanical pencil out from one of the pockets of his pants. "Okay. I think we can come up with something- I've seen devices that probably qualify, though I haven't examined them up close." He starts sketching something approximate on the nearest paper surface- a napkin. "The control system might be an interesting piece of redesign work, since, um, you don't have human-style fingers, but.."