1. Take the
pasticine (modelling clay) out of
the ping-pong base.
2. Put the marble in the base.
3. Tape the other half of
the ping-pong ball to the top of
the paper tube.
4. Stand the clown on a slight
The clown will flip
from head to toe and over again
as the rolling marble makes the
center of gravity move from one
end of the clown to the other end.