Twisting Spiral

Estimation, Motion 13 January 2014 0 Comments

Take a look at the spiral created by Gianni A. Sarcone below.  Does it appear to be moving in a clockwise direction?

Twisting Spiral by Gianni Sarcone

Now start on the outside and follow the lines that make up the spiral around in a clockwise direction.  Do they spiral to the middle?  Or is this really made from a series of concentric rings?  This colorful optical illusion is an example of the Fraser spiral illusion.  The effect was discovered by British psychologist James Fraser in the early 20th century.

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