Hoovering ball

One of the best!  Can easily be placed almost anywhere

Why does not the ball fall aside? How can it fly? The consequence of different air pressures is clearly seen. Children love playing with the ball.

This exhibit is often referred to as Bernouilly blower, though Bernouilly principle has little to do with the physics involved. A better name would be Coanda blower. 

Supply: 220V
Maintenance: None