The criticisms of tracked hand motion are spot on, at least with regards to the Leap Motion device. But even if the controller were to work well, having no feedback makes actually interacting with the environment extremely difficult.<p>So I hacked together a haptic glove out of an Arduino, a few vibrating motors, and a WebSocket-to-Serial-Port bridging program in a weekend. Took it to National Maker Faire and demoed it to a few hundred people. There were only a handful of skeptics, and of them, only two of them walked away unconvinced. Even basic haptics has a huge impact on the believability of the motion interaction.