Golden Ratio Spiral
r(θ) = r0 · growth^(2θ/π) — a logarithmic spiral overlaid on the Fibonacci square tiling.
growth = 1.618
b = growth^(2/pi) = 1.358
== golden ratio (phi)!
r(θ) = r0 · growth^(2θ/π) — a logarithmic spiral overlaid on the Fibonacci square tiling.