There are two types of people in the world: those who preferred geometry in high school, and those who preferred algebra. I preferred algebra. But whether you liked geometry or algebra–or even if you hated them both–you will enjoy the following geometry movies.

Not Knot Part 1 and Part 2 — All about knots.

Outside In — How to turn a sphere inside out.

Grace and Peace

(Thanks to: SciAm Observations)