The entire world is a tablet screen to Gilad Lederer, co-founder of OTM Technologies and co-creator of a smart pen called Phree. His smart pen writes on any surface and automatically sends pen stroke data to any app on his smartphone.
Lederer isn’t using magic to do this; he’s using a 3D laser interferometer to track motion on any surface and capture it in high definition with a special optical sensor. We saw it in action over Skype, and were amazed by its accuracy and complete lack of latency.