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Edit: moved from other thread.
What do you make of the spiral radius? I think she means that the spiral is not infinite, but that one arm goes out to a straight-line distance of 4 from the source, while the other goes out to 5. There is a straight line 9 lengths long which connects the two ends and goes through the centre, so it looks like a wave (passage of time). This would be some kind of complex quadratic function. Relations of light dark, conscious unconscious etc.
The point is that there is an 'artificial' asymmetry built-in, creating 'natural' dynamics. You could equalise the crests and troughs by having alternative waves of 5 and 4, or have the crests always 4 and the troughs always 5. Once the reader has glommed (been educated into) the dynamic, it can be modified at will by the speaker to demonstrate dynamic eruptions, while providing the comfort of an underlying structure.