Fig. 2

Examples of white-squid Sitting behavior. (A) Two animals with fully extended fins and curled arms overlap in an open space. The overlapping effect creates complexity by merging chromatic components. (B) Three animals with body patterns ranging from dark uniform to disruptive are stacked next to an algae-covered rock, giving the impression of collective camouflage and/or masquerade with the rock. (C) An animal uses live rocks as protective shelter, showcasing a dark mottled body pattern that blends with its surroundings. (D) An animal rests at the bottom of the tank with its fins fully extended and transparent, overlaying chromatic components on the fins over the substrate, resulting in a gradual transition from the substrate to a non-transparent chromatic expression of the Disruptive pattern (see Supplementary Video 1). (E) Two animals position themselves between a rock and an array of wooden branches, revealing a light-mottled body pattern. (F) Two animals are stacked atop one another with uniformly dark body patterns, creating a visual fusion that obscures contour detection. (G) An example of masquerade, where an animal displaying a dark mottled body pattern has positioned itself next to an algae-covered rock, with Raised arms (see sideview in the Supplementary Video 2, around the time 2:20–3:20).