Squid skin contains specialized cells called chromatophores that enable the animal to rapidly change its coloration and patterns. These chromatophores consist of pigment-filled sacs that can be expanded or contracted by radial muscles.

When the radial muscles relax, the pigment sac expands and disperses the pigment, resulting in a darker coloration. Conversely, when the radial muscles contract, the pigment sac compresses, and the pigment concentrates at the center, making the skin appear lighter or transparent.

By precisely controlling the expansion and contraction of chromatophores, squid can match their surroundings, camouflage themselves from predators, communicate with other squid, and even display mesmerizing patterns during mating rituals.

Furthermore, some species of squid possess multiple layers of chromatophores, each containing different pigments. This arrangement allows them to generate complex color combinations and intricate patterns, enhancing their camouflage and communication abilities.