Brain tricks

1. Follow the moving dot with your eyes. All dots will remain pink.
2. Now, stare at the black plus sign in the center. The moving dot turns green.
3. Keep staring at the plus sign. Eventually, all of the pink dots disappear.

However, there is no green dot at all, and none of the dots actually disappear. When you blink, the dots will re-appear, than disappear again. How?

In the comments on reddit.com: Very cool illusion: There is no green dot, cecilkorik explains:

The color magenta saturates the red and blue cones in your eyes. At first, your brain correctly assumes that’s normal and you see exactly what the image is displaying. After a few seconds of seeing the exact same pattern though appearing on the exact same cones, your brain starts to second-guess itself. The internal color balancing of your brain kicks in and starts compensating for what it thinks might be underreporting green cones in those areas by becoming hypersensitive to their signal.

Basically, it is trying to re-color-balance those “defective” magenta spots to make them appear gray, like the rest of the image. As a side-effect, when the magenta spots actually disappear (become gray) the green cones in those areas have been so hypersensitized that the spots appear green.