Amazing things come out of MIT every day, such as this one...
Mouseless is an invisible computer mouse. By the use of infrared laser beams the user can move their hand like they would with an actual mouse. Just cup your hand and tap on the table surface and Presto! ....just like magic.
In the case of the Mouseless project, the infrared laser and camera are embedded in the computer. When a user cups their hand as if a physical mouse was present under their palm, the laser beam lights up the hand that is in contact with the table. The infrared camera detects this and interprets the movements. A working prototype of the Mouseless system costs approximately $20 to build, says Pranav Mistry, who is leading the project.