Thanks Bagger. I like 'em! The challenge is going to keep it simple, but to not introduce them to the three imperatives would just be criminal!

Instead of the comb I plan to use paint stirrers! I am also going to use the Birdie Ball, in the hope that they will not become distance oriented from day 1. Instead of the coke can I will substitute small bean bags. They are made from a silky material so it is not an easy thing! Silly putty sounds like a good idea for introducing #3PP. I am looking for a low bench to demonstrate tracing. Thanks for the help.