Yet as the twenty-four slits passed the eye, the twenty-four different positions blended into one continuous jumping movement of the poodle.
But this so-called stroboscopic phenomenon, however interesting it was, seemed to offer hardly any difficulty.

The friends of the zooetrope surely knew another little plaything, the thaumatrope.

Dr.Paris had invented it in 1827.

It shows two pictures, one on the front, one on the rear side of a card.

As soon as the card is quickly revolved about a central axis, the two pictures fuse into one.