On Matters of Weight

My little toddler does not have any concept of weight or proportion. This is very apparent when he tries to play with a particular toy. This toy uses the forces of air to send balls from one end and have them pop out the other. He loves this toy. He knows that when he puts a ball in, it should come out. However, he has been trying to put things into this toy that it wasn't designed to accept. Flashlights, pens, binkies, anything that will fit into the hole. Then he can't figure out why 1. they don't shoot out the other end, and 2. why the balls that belong won't fit into it either. He quickly learned that some balls are too big to fit into the toy. He no longer tries to shove his basketball into the ping-pong balls sized opening. However, he has a bouncy ball that he loves. It is red, lights up when bounced, and very cool. It is also considerably heavier than the balls used in the toy. It does fit down the tube, and comes out easily when the toy is upended, however the air pressure is not strong enough to push it out the other end. He cannot understand why it does this, and he isn't going to grasp a lecture on weight ratios and wind tunneling. I guess he will have to figure it out himself. Aaah the joys of discovery!