Why does this balloon have -1 holes?

Thank you to BetterHelp for sponsoring this video! To get 10% off your first month of therapy, go to to sign up today. If you are need of urgent mental health support please check for crisis help lines available in your country. USA: UK: Do check out Jordan Ellenberg’s book Shape. This video was inspired by Chapter 2. Support me on Patreon and I will post you a free torus balloon. I hope I don’t regret this. Here is Sam Hartburn’s geogebra file: Trouser animations thanks to: Bentley Davis Em Raymond