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"Each ball is moving in a straight line."Quote:
Originally Posted by Bob Harding
That is true, but not moving at a constant speed. That is why it works.
Answered my own question. Yep, the diameters have to be in the ratio 2:1 or it doesn't work. Discovered by a 13th century Persian astronomer, apparently.
If you want to see some more of these illusions, take a look here:
Rose-Henig, Alex | Best Illusion of the Year Contest
Coop
Not if you have an iPad or iPhone. The illusions use Flash.Quote:
Originally Posted by C00P
[ame=http://www.youtube.com/watch?v=YZf0Q-v3u-k]If you don't revise properly...You Shall Not Pass! - YouTube[/ame]
What was that about? :confused:
Even if, like me, you've never actually seen Lord Of The Rings you must be vaguely aware of it. Y'know, Gandalf (Ian Mckellen) and all that?Quote:
Originally Posted by p38arover