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Alright, here are some little quiz-type things I've gathered throughout the years. If you know the answer please post and give a short explanation.

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The photographs below show an interesting triangle that may bother some people.





If this bothers you, you are invited to explain how this setup works.

I believe:

(a) the pendulum is swinging through the triangle; so what!
(b) the pendulum is swinging behind the triangle.
(c) this is another trick using a computer animation.
(d) the "triangle" is formed using three orthogonal square rods.

The beauty of it is that is impossible, or at least it appears to be.

It's an optical illusion.

It is possible to create a real 3-D model which, when viewed from the correct angle, appears as an impossible triangle.



http://www.cs.technion.ac.il/~gershon/EscherForReal/

Very good ya'll, of course this is an optical illusion.

Click here to see the small explanation video.

The second d, none of them will move.
*edit*I'm assuming they're supported from the center of mass*

This brings to mind an unpleasant experiment I had to do a while back.
Given a disc of unknown mass, with several weights of unknown mass randomly distributed upon it, a piece of string, a pivot upon which you can mount the disc so that it is perpendicular to the ground, and the various other things you always have, calculator, pen, pencil, ruler, etc, determine the local acceleration due to gravity.

Well, as it is suspended by the center of gravity, none will move, because it is balanced. So i go for awnser D2.

yeah, wasn't that triangle one of escher's tricks???