You know how I love my optical illusions so here is a nice one from the Mozilla developer demo site (cira 2015). When I saw it first I just saw a mess of concentric circles. Now whenever I look at it, I can only see the 3D shape. There's a few other demos on the current Mozilla demo site, but this page is about 3D Spirals. Here is the example recreated here.
Not quite spiral, move like tubes, but they still have the same effect on the viewer!
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