While touch sensing is commonplace for single points of contact, multi-touch sensing enables a user to interact with a system with more than one finger at a time, as in chording and bi-manual operations. Such sensing devices are inherently also able to accommodate multiple users simultaneously, which is especially useful for larger interaction scenarios such as interactive walls and tabletops.
This tunnel in Russia is the longest in-city tunnel of Europe. There is a river running over it, and water leaks at some points. When the temperature reaches -38 degrees, like it did this winter, the road freezes and the result is the attached video taken during a single year with the tunnel camera.