Circles are not moving!!! Maybe you should see a doctor.

i'm joking ... they are moving in opposite directions,
Strange!

just a long shot but...

firstly its an irrittating thing to watch.
moreover, when u look at a circle of petals... it tends to stop turning... i.e the other ones seem to start turning. hence i guess people under a lot of stress end up getting agitated real quick and cann't focus at the image consistantly for more than a few seconds/ microseconnds... resulting in the illusion of the fast moving petal rings..