Swirling Retina , by marcel barbeau , 1967 , abstract , Op Art style , Pattern, Line, Textile
A red and green striped background with wavy lines.
 an optical illusion. The illusion is made up of red and green lines. The lines are wavy and intersecting at different points. The green lines are more uniform in size and shape than the red lines. At the bottom of the image, there is a white line that looks like a Christmas tree.