I agree, the Foucault example would make a good Juypter demonstration. Showing the pendulum in 3D with a 2D projection (like a Spirograph) of the motion on the

I agree, the Foucault example would make a good Juypter demonstration. Showing the pendulum in 3D with a 2D projection (like a Spirograph) of the motion on the ground would be especially nice, as in: https://demonstrations.wolfram.com/FoucaultsPendulum/ https://demonstrations.wolfram.com/FoucaultsPendulum/ This might be possible in a Jupyter notebook with WebGL.