Two ringsThe inner ring appears to contract while the outer one appears to expand (peripheral drift illusion). Moreover, the rings appear to rotate in the opposite directions when observers approach or move away from the image fixating at the center. Furthermore, the inner ring appears to be more reddish when observers approach the image fixating at the center, while the outer ring appears to be more reddish when observers move away from the image (color change illusion). This image thus gives three different illusions.
