Optical slash Visual illusions

The two circles seem to move when the viewer's head is moving forwards and backwards while looking at the black dot.

The horizontal lines are parallel, even if they seem otherwise.

Can u see black (not white) dots at the intersections?

The two orange circles are the same size.

Duck or Rabbit ?

This is a flower vase (or is it a two-silhouette profile?)

Are they spinning or not ?