IDENTITY / SEED / CHANNEL
Change the palette.
Keep the place.
Each wall keeps its choice wherever you encounter it. Compare seeds, switch independent channels, and reverse emission order.
All channels use the same eight preview colors to make choice changes visible. They do not alter geometry or collision.
Lars Rocha's indexed-randomness idea motivates this study. IXV1 is a separate deterministic FNV-1a mapping, with no uniformity, cryptographic or sitoolz RNG compatibility claim.