This is one of my earliest color optical illusions. There is no yellow or green in the diamond shapes, just vertical black lines! (If you don’t believe it, use a eyedropper tool to check it.) This intriguing visual effect is mainly due to “color contrast induction“.
Below are the animated versions of my op art:
Some intriguing variants. The yellowish and greenish spirals within the radiating patterns are actually made of black segments.
These illusions are available as prints and canvases from my online official gallery.
Related illusion: illusive color radial beams