In this chapter, we learn that the name of the ball trick is derived from the way in which the balls appear to one another. In other words, the balls are made from wood rubber, which is the same material used in the cup trick. The balls can also be made of other materials, such as coconut husks, and the name "ball multiplying" comes from the shape of the balls. The ball-muffling trick is a little different from the cup-and-ball trick, in that the ball is made of smaller balls, which are easier to hold. The trick also involves licking the smaller balls with the palm of one's hand, a trick that is very popular among children.