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In case you missed it, 3B1B has a brilliant video introducing quaternions: https://youtu.be/d4EgbgTm0Bg

His videos are really incredibly intuitive and well-made. He deserves an award for his channel.

Yep, and all the source code is developed in the open as well! https://github.com/3b1b/manim

Apparently part 2 is interactive and his patreon supporters already have access to it