ChaosFissure In reply to RationalParadox [2016-07-05 14:38:43 +0000 UTC]
There are numerous ways to create spiral shapes, though very specific universe-like shapes wouldn't be easy.
There are a couple of things you can look for - transforms offering circular motion, like foci, spherical, or curl (with variables!) scaled down pretty small and perhaps skewed significantly. Alternatively you could use a transform that has a low value of horseshoe (like 0.1 or 0.05 or something pretty small), which seems to have a reasonable effect in certain setups - but you may also need to move it around, rotate it, or skew it a bit to get the effect you want as well. I can't really say without manually being able to experiment with things, as fractals are pretty dynamic!
If you want to have some fun, substitute linear with curl -- curl acts as linear when all variables are set to 0, but introduces curves like spherical or foci once you start messing with them!
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