That your brain is still registering the light from the last negative change that you begin to see each dot as a three dimensional cylinder, when it is really just four black dots on a white background, or vise-verse.
That your brain is still registering the light from the last negative change that you begin to see each dot as a three dimensional cylinder, when it is really just four black dots on a white background, or vise-verse.
Oh god... and they start to go the other direction, or create false colors when you look at it long enough... and the fact that they spread out and blend supplies room for even more trippiness.