Mac and Tosh are roommates. Sure, Mac is the home and Tosh is living inside him, but they like each other and don't mind the living arrangements. Tosh easily comes in and out of his hole to play with Mac and anyone else who is game.
The pattern gives detailed instructions (with pictures) on how to create Tosh's worm home inside the apple. Plus there is instruction on a plain apple if you would like to create one without the hole.
Size E (3.5mm): crochet hook