Why there are some wave cross in led display when photo it.

Why there are some wave scorss in led display when photo it. It''s because of a phenomena called pyramid illusion. You can see this phenomena in below flash. The pyramid illusion (also called the Vasarely illusion) is a striking perceptual effect related to all phenomena involving lateral inhibition, e.g., the Mach Band or the Craik–O''Brien–Cornsweet illusion. It has been incorporated into many Op Art paintings such as Arcturus II by Victor Vasarely (on the right). The effect occurs when concentric squares (or other geometrical figures like the star) of decreasing size and luminance are stacked on top of another. Luckly after we adopt the newest art we solved this difficult problem.