The paper ball
Everyone writes their message on a sheet of paper, crumples it up and throws it out of frame. The next person picks it up, unfolds it, reads it, and starts over. Once edited, the same paper ball travels through the whole family without ever touching the ground.
The detail that matters
The throw and the catch share a direction: everyone throws to the right, everyone catches from the left. It is the only instruction to give, and it is the one that creates the illusion.
