Here is how you can fold a piece of paper into an ellipse:
1) Cut a circle from a regular piece of paper
2) Draw a dot inside the paper circle
3) Fold it so that the circumference falls on that point
4) Repeat this procedure using random folds pic.twitter.com/T4s3hUcIY9

— Fermat's Library (@fermatslibrary) December 4, 2019