You know what I find disappointing about you people? You seem to have no imagination. You see something like this, and assume it will always be like this. Like it will always be some big equipment projecting stuff onto your hand. You don't think beyond what this is currently to what it could be. This is just the first time we've seen something like this, it could go in a million directions.
Also, it wasn't some guy who made it, it was Microsoft. I think a few people made it before, and then Microsoft picked it up.