Meet the Omnicopter: an omnidirectional 6 degrees-of-freedom flying machine that generate forces and torques in any direction. It is a 45cm cube with 8 brushless motors and propellers that can produce negative and positive thrust. Due to its design, the quadcopter is capable of flying at arbitrary altitudes.
The Omnicopter has control over all its degrees of freedom. It can hover on the spot and perform challenging maneuvers. This video gives you a better idea what this flying machine is all about.
[Source: Dario Brescianini]