There are small projectors, pocket sized, for your mobile phone — like a projector for my iPhone. It could be very interesting to have that do a real-time projection of your phone’s camera capture, so that I could film myself and be projecting it onto something in front of me as I moved — like shrinking myself?

Or I could use it like a laser pointer/flash light as part of a piece that detects the light and reacts with your device.