My eyes are cheating

The "blue" and "green" are identical

This optical illusion freaks me out a little. Apparently, the “green” and “blue” spirals in the picture are exactly the same colour.

“No way,” says I, but if you check it out up close (and/or in Photoshop), they are identical. The reason they look different has to do with the colours of the zigzaggy lines that cross the spirals.

[O]ur brain judges the color of an object by comparing it to surrounding colors. In this case, the stripes are not continuous as they appear at first glance. The orange stripes don’t go through the “blue” spiral, and the magenta ones don’t go through the “green” one.

Found via Mindhacks.com.