Fun with trig functions

Having finally looked up how to produce big images in processing, I've been having great fun digging up code I originally wrote more than a decade ago in POCO (the Autodesk Animator Pro variant of C), translating them into Processing and whipping up stills which are potentially big enough to print at about two feet across (I'm settling for 2500x2500 for now - nothing seriously vast). Here's a sampling...
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