Can someone explain to me how this illusion works?... the hermann grid illusion?

http://www.owlnet.rice.edu/~psyc351/Imag鈥?/a>





check it out... why do i see black dots wen there arent any?Can someone explain to me how this illusion works?... the hermann grid illusion?
Something to do with your eyes only being able to focus well on one point, and your brain filling in everything else.





I love illusions...Can someone explain to me how this illusion works?... the hermann grid illusion?
the surrounding black is what does it.
i see black dots too.
Pure %26amp; simple magic... right?