You can "see" a white equilateral triangle but in fact none is drawn.
The nonexistent white triangle appears to be brighter than the surrounding area, but it has the same brightness as the background.

The moving empty space between dots will appear as a green dot.

The moving green dot will appear to wipe out the purple dots, until only the green dot is visible.

A separate effect appears if the eyes move away from the center, showing a ring of green dots.

a: they are the same size

A: They are the same colour

A: They are the same colour

The rectangles on the black stripes seem lighter than the ones on the white stripes

A: the black lines are parallel

There is a pipe hidden in the water

You can read good in black and evil in white

Good can't exist without evil

哇！！！这个大象的视觉错觉很奇特