Understanding the constructive and destructive part of it (mochaik).
Putting the Little Plastic or Rubber Cups on the Bottom of Chairs or Tables and Blowing Bubbles on Shabbos;
interesting practical applications which apply to coloring foods on Shabbos;
Pushing Out a Dented Water Bottle, Using Toys That Are Made to Deflate and Put Away, Putting Back a Nail in the Shoe, and...