See it move
One step at a time, forwards and back, at your own speed.
Algorithms, proofs and derivations one step at a time, forwards and back.
The real thing, not a picture of it. Try it.
01
Watch quicksort pick each pivot, a heap sift each value, or a proof take each line, with a caption saying why.
02
Play it, pause it, or go back a step to see what you missed.
03
Lessons stop at the interesting moments and ask what happens next.