Look at this very special kind of motion https://www.shadertoy.com/view/lds3Wl
First I thought the clover turned clockwise, then by looking at the dots I thought it turned counterclockwise. Then I realized all dots are moving on straight lines. If the dots were electrons I wonder what the magnetic field could be? In the direction through the screen the B-field could be positive, negative or zero. I suppose it is zero since there is no net rotation of charges? David
