I'm a mathematician and have been planning on starting a mathematical project for a while. When I saw that this month's competition is STEAM I got the motivation to do it. I started cross stitching this year, I know it's not as polished as some I've seen in here, but I'm proud of it ☺️

In case you are interested: this is how we describe certain spaces in topology. If you had a sheet of a very flexible material and you glue the sides as indicated by the arrows, you should get something that looks like the figures below. (The easier to visualise is the middle one, you can try using a piece of fabric)

Pattern made in https://flosscross.com/designer using a picture.