It's a Phi Spiral based on the Fibonacci Sequence, Sacred Geometry.
https://www.goldennumber.net/spirals/

If you know the sequence and how to read it, you can look into the mirror and see it in action because your face is 'built' on those ratios. Most of your body is. You're actually closer than you think with your own feelings although being honest I don'r subscribe to this rainbow or other such-labelled Soul. Your Soul is 'walking the spiral' so to speak - it's symbolism not literal - and as you walk the spiral upwards (relatively speaking) the more you become conscious the more you become conscious of. The symbolism works for both you and your Soul. Exponential growth/development if you want to call it that - the more you grow the 'wider' you grow.