If the picture fragments, hit the RELOAD button.
Click on the "No Window" button. Each rod follows a clockwise circular path,
and the center appears to do the same, although it is really moving counterclockwise.
Reason: the motion of the line tips (terminators) is seen correctly, and propagates
along the lines and is blindly assigned to the center.
Click on the "Textured Window", Gray Window" or "Mobile Window", and the center
will be seen correctly as moving counterclockwise.
Reason: The line tips are now perceived as hidden or invisible, so their motion no longer
propagates to the center.
If the picture fragments, hit the RELOAD button.... ....Thanks to MARK BECKER.