The large brown crochet model might be 6765-
It shows various configurations, like a whirlpool, or frilly edges .
The diagram shows eddies and folding. One can play with models to discover connections with Nature and Processes. A vortex is a cone upside down. One can crochet or knit plain rows between the increase or decrease rows. The Patterns could be read backwards if knitting in which stitches are "knit 2 together". The number of plain rows determines if it will be a cone or ripples; see previous posts for the maths. When knitting, we can use circular needles, any number to accommodate the larger number of stitches, or a number of double pointed knitting needles can be used.
There may be umpteen websites on Vortexes; many are coming online recently, it seems. A year ago I didn't find much.
In Resurgence magazine May/June 2008 issue, page 71, there was a review by Chris Clarke on a book by Fritjof Capra on Leonardo's Science. Mr Clarke said "I have spent many hours on bridges looking at weirs and sluices, and I find that Leonardo's notebook drawings based on transformations of mathematical spirals, just do not look like turbulent water........ Concepts of energy and vorticity developed by Helmholtz do enable me to see..." ....this amazing world around us.
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