From Huddlelamp: HuddleLamp uses free and open source computer vision software to continuously track the presence and positions of devices on a table with sub-centimeter precision. At any time, users can add or remove devices and reconfigure them without the need of installing any apps or attaching markers. Additionally, the users’ hands are tracked to detect interactions above and between devices. All this information is provided to a free and open source Web API that enables developers to write cross-device Web applications. These applications can use all this information to become “spatially-aware”. This means that the applications can react to how the devices are arranged or moved in space. For example, physically moving a tablet on a desk can also pan and rotate the content of the screen, so that each device appears to be a kind of peephole through which users can view a spatially-situated virtual workspace. When putting multiple tablets or phones side-by-side, these peepholes turn into one huddle or federation of devices and users can interact with them as if they were just one large display. Check it out at http://huddlelamp.org Huddlelamp setup
