Wikipedia has this animation of the Maclaurin series converging for e^x, but it emphasizes the right-hand side, where the behavior is much less bizarre, and only hints at the left-hand side where the partial sums flap back and forth like a screen door in a hurricane.

For quite a lot of these, I think it's not at all obvious that the vertices coincide with the vertices of a regular octagon, and I might not notice it if it weren't pointed out.

This famous illustration is from Moses Harris’ 1760 book _The Natural System of Colours_.

Why is the label for yellow written backwards?

“To deal with hyper-planes in a 14-dimensional space, visualize a 3-D space and say 'fourteen' to yourself very loudly. Everyone does it.”

Three hamiltonian cycles on the dodecahedron:

YOU MATHEMATICIANS THINK YOU SO SMART, THAN EXPLAIN THIS!!1!

Here is Ms. 13 constructing a finite projective plane of order 4.

A Mastodon instance for maths people. The kind of people who make $$\pi z^2 \times a$$ jokes. Use $$ and $$ for inline LaTeX, and $ and $ for display mode.