Cuttlefish Camouflage Lab (2D)

This 2D top-down companion drives a real closed-loop chromatophore controller rather than a decorative colour slider: three pigment channels — yellow, red-brown and black, layered over a pale iridophore base — are adjusted every frame by a gradient-descent step that pushes the cuttlefish's rendered skin colour toward whatever colour a procedurally generated reef shows directly underneath it. Match quality is scored with the redmean formula, a low-cost approximation of perceptual colour difference used in real image-processing pipelines, so the on-screen percentage reflects an actual colour-space distance rather than an arbitrary number. Turning up reaction speed closes the gap faster after the cuttlefish drifts across a patch boundary; turning up swim speed forces it to cross boundaries more often, so the controller is constantly re-adapting instead of settling.