Fletcher’s Corner

Fletcher’s Corner

The Strange Shapes You Can Make With A Square

From a doughnut to a 4D bottle.

Fletcher Thompson's avatar
Fletcher Thompson
Feb 15, 2025
∙ Paid
Images by me unless specified otherwise

The shapes you’ll see in this article are made by stretching, bending and gluing a simple square. The field of topology formalises these things.

Here’s the plan:…

Keep reading with a 7-day free trial

Subscribe to Fletcher’s Corner to keep reading this post and get 7 days of free access to the full post archives.

Already a paid subscriber? Sign in
© 2025 Fletcher Thompson
Privacy ∙ Terms ∙ Collection notice
Start your SubstackGet the app
Substack is the home for great culture