How do octopuses change color so quickly?

Octopus skin contains several types of specialized cells that work together to create rapid color and texture changes. Chromatophores contain pigment sacs that expand under muscle control, producing red, brown, yellow, and black patterns. Beneath them, iridophores reflect light and can create metallic or iridescent effects, while leucophores scatter light to brighten or whiten the skin. These changes help octopuses camouflage, signal, and sometimes mimic other animals. The speed and precision of this system make octopuses some of the most advanced camouflage artists in the animal kingdom.