Moving this video to mintbbb's personal queue. It failed to receive enough votes to get sifted up to the front page within 2 days.

*promote

Promoting this video and sending it back into the queue for one more try; last queued - promote requested by chicchorea.

*art *animation *wtf

Adding video to channels (Animation, Art, Wtf) - requested by ant.

This is a really nice example of sinusoidal motions and Lissajous trajectories! The center of mass of all the points makes a circular 1:1 Lissajous trajectory, which gives the false impression that the points are curving: http://en.wikipedia.org/wiki/Lissajous_curve.

However, to mark this as an 'illusion' is a bit of a stretch. Illusions are created by a failure of our assumptions about a system we are viewing, and strong illusions maintain this failure upon viewing even when the mechanism of the illusion is revealed to the viewer. Many people may have the 'illusion' that the balls were traveling in arcs in the beginning, but once it was pointed out that the balls were traveling in straight lines, viewers have no problem viewing the original movie without being deceived. To call this an illusion would be like calling horse galloping an illusion: http://100swallows.wordpress.com/2008/06/29/horse-dont-hop/, which is another case where people were just incorrectly applying their intuition, rather than properly observing the details.