Your eyes are making it move. To test this, stare at one spot in the picture for a few seconds and everything will stop moving; OR look at the black center of each circle in the first picture, and it will stop moving; but when you move your eyes to the next black center, the previous one will move after you take your eyes away from it.
One-fourth of the world's population lives on less than $200 a year. Ninety million people survive on less than $75 a year.
We have two lives - the one we learn with and the life we live after that.
~Bernard Malamud