The Legend of Nintendo
I find it amazing that, to detect hand and leg movement,  the Vive and Oculus teams had to do so much on coming up with expensive sensors and configurations. These systems require the need for a dedicated room, which has been setup basically by experts.Nintendo delivers 80% of the experience and 100% of the fun with an IR camera (already in the switch) and some $4 cardboard they sell for $80. And it is portable!While the better sensors will definitely win in the long run, this is one of the best instances of engineering simplicity and "perfect being the enemy of good enough". It's hard to be anything but speechless.