A spiral of blue and green ... or is it?

The green and the blue spirals are the same color.

Full article at: http://www.slate.com/blogs/bad_astronomy/2009/06/24/the_blue_and_the_green.html

Graphic by: Akiyoshi Kitaoka http://www.psy.ritsumei.ac.jp/~akitaoka/color12e.html

Best thing like this I've ever seen... I had to put them side by side in Paint to convince myself:



Thanks for sharing!

One of my previous psychology degree modules had a section on illusions; I love them, makes your head hurt trying to work them out

This really did things to my brain.

Nice illusion you might like this as well to improve your Jedi skills



Hold the center of the printed image right up to your nose. It should be blurry. Focus as though you are looking through the image into the distance. Very slowly move the image away from your face until the two squares above the image turn into three squares. If you see four squares, move the image farther away from your face until you see three squares. If you see one or two squares, start over!

When you clearly see three squares, hold the page still, and the hidden image will magically appear. Once you perceive the hidden image and depth, you can look around the entire 3D image. The longer you look, the clearer the illusion becomes. The farther away you hold the page, the deeper it becomes. Good Luck!

It's not really a trick, since the spirals don't comprise of a single colour, and our eyes/brain mixe them. Some of the colours we see are not on the EM spectrum at all, they're a mix of other colours. One of these non-em colours is.. you guessed it, magenta, the after-image of which is a blueish green.