Moiré effect/illusion - live Geogebra build

In the spirit of trying to record some more live creations (done without preparation to try to model the creative process, problems and all!) I thought I'd have a stab at creating a Geogebra version of Masaya Ishikawa's lovely physical version. Apart from the opening moments this is a live-one-take recording. Apologies for the occasional construction noise in the background.

[jake]

Watching you work through a problem in real time is wonderful.

[itsreeah]

That’s cool that you’re a musician, icing

[jwvdvuurst]

I know geogebra, but I was not aware you could create this kind of beautiful things with it!

[JamesOliverBiSM]

Does the Moiré pattern from this relate to the math of fields? It looks identical to magnetic field lines.