A small move can make big changes. Plant a seed and you'll get a forest!
A platform(land) covered with soil and a pot in front of it will be placed in front of the crowd. People can place the seed into the pot, and dozens of trees will grow out from the soil platform in set sequence. After the previous participant leaves, the trees shriveled back to the underground, and wait for the next person to plant the seed.
Introduction to Physical Computing