This is one of my favorite toys for teaching cause and effect with preschoolers!  It also teaches skills like: putting toys in, pressing a lever, and turning a dial to make sounds.  When you push the lever down, the toy lights up and music plays at the same time one of the balls spins through the inside of the toy and rolls out of the bottom right in front of the child.  You can turn the lights and sound off to simplify the cause and effect to the lever and ball if you want.  However, kids usually love learning how to make the lights and music play!