Another eye trick. For this trick, get close to
Look in the middle of the blue area at one side of the lightning
Then look back and forth from one side to the other.
You should see lightning bolts appear quickly and
dissapear just as quickly.
This happens because your eye holds the color red longer than the
When the red hangs around while you look at the blue area, your eye
registers a white color.
(just long enough that it looks like a flash)