Season 1- Episode IV: Chromatophores and Intelligent Camouflage

Sources:

https://www.cs.mcgill.ca/~rwest/wikispeedia/wpcd/wp/c/Chromatophore.htm

https://ocean.si.edu/ocean-life/invertebrates/how-octopuses-and-squids-change-color

https://ideas.ted.com/oddballs-with-high-level-intelligence-a-q-a-with-roger-hanlon-about-the-amazing-octopus/

https://news.berkeley.edu/2016/07/05/weird-pupils-let-octopuses-see-their-colorful-gardens/

https://www.scientificamerican.com/article/how-do-squid-and-octopuse/

https://www.sciencedirect.com/science/article/pii/S0169534718302672