OP ART
The green and the blue in this image are actually the same color.
"Ropes"
Concentric circles appear to be distorted.
"Willow beading to the wind"
Although beads are aligned vertically, a pair of two rows appear to tilt alternately. In addition, anomalous motion illusion is also observed.
"Gabor patch drift illusion"
The inner square region appears to move.
"Rings of rain"
The rings appear to rotate when observers approach or move away from the image keeping their eyes fixed on the center. Moreover, the inner two rings appear to be spirals.
