**How to make color-changing 'Transformers' with polymers**

Shape and color changing are key survival traits for many animals. Chameleons can change their body to hide from predators, to reflect their moods, or even to defend their territory, while some soft-bodied animal-like octopuses, squids, and cuttlefish can change both their color and shape to signal or camouflage.

https://phys.org/news/2023-09-color-changing-polymers.html