Bring to class two identical sets of blocks (or other objects). Invite two class members to participate in the following demonstration. Give each participant a set of blocks.
Designate one class member to be the leader and the other to be the follower. Have the two class members turn their backs to each other so they cannot see each other's blocks. Have the leader quickly build something with the blocks and give directions to the follower on how to build an identical structure. Neither participant is to look at the other's blocks until the project is complete.