We’re getting closer and closer to the futuristic spatial computing seen in the movie Minority Report. Last year, somebody did it with clunky mittens and a roomful of huge monitors. This year, PhD student Pranav Mistry has miniaturized it all into a pendant. Yes, that’s right: it’s wearable spatial computing — or, as Mistry likes to call it, a wearable gestural interface.

Mistry’s technology, which he calls SixthSense, is built on an incredibly simple hardware combination: a projector and a camera. He even plans to open-source the software behind it. The best part: Mistry says the whole system costs only $300.