Can you draw this shape? Imagine writing the number 8 on its side! Once you start this shape can go on and on forever. Practise drawing this shape (trace an adult's one to begin with if you prefer) and keep going over it as many times as you can without taking your pencil off the paper.
You might like to try it with chalk, felt tip pens, pencils or using your finger in some sand. Once you get the hang of it try drawing it as big as you can, using your whole arm, and then as tiny as you can using just your fingers!