My boss just told me that he stared at this thing for a long time and sees nothing, but I definitely see red! This is so amazing. The wheel is called Benham’s top and it creates an illusion of color when black and white patterns rapidly change. The higher the speed, the more obvious the color effect and reversing the wheel can also change the shade.
The existing theories do not explain this completely, now this is being researched for use as a diagnostic tool for diseases of the eye.
Image: daily mail