That's how it works. It's a two step process.
1) Existence of shelves
Sorry for the lack of sound for the beginning of the video. That was a mistake, but it's too late to fix it. Thank you for watching our extremely cute cat.
The end flag is the little black thing in the top right hand corner. The IPad cut it out of the frame because it wanted to be mean to me. It's okay though. We all have bad days, and that is valid. Even if you're an IPad.