
The pattern includes complex plane, so I think that I can describe Riemann surface.
.gif)
θ=2nπ (n=0,±1,±2........) and arg Z=θ+2nπ (-π<θ≦π).
Therefore, arg Z change according to n.
n=0 → -π<arg Z≦π
n=1 → π<arg Z≦3π
n=5 → 9π<arg Z≦11π
n=-5 → -11π<arg Z≦-9π
∴(2n-1)π<arg Z≦(2n+1)π
Complex planes Z depend on n, and these are piled infinitely.