2-D/3-D Handball - Frame-by-Frame Stop Motion: The Guide to Non-Traditional Animation Techniques - page 170

ExErcisE Fig 3.A A sequence of
a two-dimensional bouncing
ball cycle.
ExErcisE Fig 3.B The cards on
a table with a backing block to
hold each one upright.
or some sort of simple support with a piece of tape or wax to help support
each drawing as you replace each in front of the camera for this exercise. You
are bouncing the graphic ball back and forth between your hands as they
slowly come together to squash the ball. You should sit behind a simple, clean
tabletop, and the camera can point directly at you. It is much easier if you
have an assistant or someone else in front of the camera as you operate the
computer and change out the drawings.
ExErcisE Fig 3.c The composition
of the handball exercise.