-- screen centre, decide what that pixel IS inside the tunnel. -- log2 of the log-space interval between ring lines. -- 2^7 = 128 sub-octave steps ≈ 2 rings per octave. -- DECREASE (e.g. 6) → denser ...
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise ...