Sinsin Indigo Moire

Newton's method applied to f(z) = sin(sin(z)) - 1/2, centred on pi / 2 where f(conj z) = conj f(z) and f(pi - z) = f(z) both hold, so the lace mirrors about both axes. Nesting the sine folds the plane twice, giving two interleaved ladders of roots that beat into the concentric moire cells. The rung of the ladder a pixel lands on picks the indigo to sea-glass family, the smooth count sets brightness, and a sin(2 pi count) ripple makes the moire rings read as contours.