Scintillating illusion

Move your eyes around this image. You probably see blue dots quickly appear and disappear at the intersections. But if you look directly at an intersection, the dot disappears.
This is called a scintillating illusion , which means that the image appears to twinkle. Located in the back of the inner eye, the retina receives light through your eye's lens. Scientists think the "ghost dots" may occur because of how certain nerve cells, called neurons, in your retina relate to each other when they receive signals from dark and light areas.