optically disallusioned

THE optical illusion of the month (or week or day or year, whatever you deem to be an appropriate length of time to apprecitate the coolness of this one)..
You see embedded spirals, right, of green, pinkish-orange, and blue? Incredibly, the green and the blue spirals are the same color. At first I thought Richard was pulling our collective legs, being a trickster of high magnitude. So I loaded the image in Photoshop and examined the two spirals. In the two squares displayed below, the one on the left is colored using the same color from the blue spiral, and on the right using the green spiral.
Read about it, analysis & RGB values and explanations all over here.