Welcome, traveler! You've stumbled upon our esteemed Appendix E, the most unnecessary, yet delightfully confusing section of our website. Within these hallowed halls, you'll find diagrams so convoluted, so bewildering, that you'll wonder how humanity ever managed to survive with such complexity.
This diagram is a circle, yet it's not a circle. It's a circle that's also a Möbius strip, which is a circle that's also a Klein bottle. Don't worry, we won't make you solve it. Unless you're an expert in higher-dimensional topology, in which case, good luck with that.