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I much enjoyed Kalid Azads Interactive Guide to Fourier Transform article on [ and was much impressed he mentioned my animated sine demo, which he extended upon in wonderful ways. ]

With recent javascript and web 2D/3D, I think we’re at the cusp of a kind of interactive learning renaissance.. because Math concepts can be made really physical, tactile and intuitive :  Show-me-how-it-works + let-me-drive beats verbose-monologue every time.

I wanted to mention another variant of the animated sine demo, where you can add a second circle and slide back and forth to see the first 2 terms of a Fourier series.


It seems like a gentle intro that would get young people thinking..’hmm, what if I add another circle… and how big should that circle be…’.

Obligatory Tolkien quote : “It’s a dangerous business, Frodo, going out of your door. You step into the Road, and if you don’t keep your feet, there is no knowing where you might be swept…”

I get a few hits for the Animated Sine demo in Javascript – maybe this is a good way to introduce young people to math?

Here is a minor update I did a while ago that shows what happens when a second circle spins around the point on the outside of the first circle…

[click the pic or here to view the animation ]

This might be a nice lead into Fourier Series…