The red rings in this image are a figment of your imagination (get this into an image editor and try to pick a red pixel). According to Scientific American:

A process called color constancy makes an object look the same under different lighting conditions, even though the color of the light reflecting from the object is physically different. Color constancy is an incredibly important process that helps us to recognize objects, friends and family both in the firelight of the cave and in the bright sun of the savanna.

Because the entire image here is drawn in shades of blue, the brain mistakenly assumes that the image is illuminated by blue light, and that the physically gray rings inside the blue structures must therefore be reddish. The visual system subtracts the blue "ambient lighting" from the gray rings, and gray minus blue results in a pastel red color.

More illusions at Illusions: Colors Out of Space