The article is a good read. I was left with even more questions:
How come that most documentaries explain the vibrant and undulating colors as some sort of communication, when in actuality there is no evidence that they can observe colors?
Even more interesting is the question where do the chromatophores get their color "data" since there are no apparent color receptors in their eyes or skin so that they can mimic their surroundings for camouflage?
From what I've read elsewhere, an octopus's pupils isolate colors via chromatic aberration. They can see a range of colors, but only one color at a time.
