Weird pupils let octopuses see their colorful gardens

Cephalods are colorblind allowing them to only see black and white but they are known to change color to blend in the with their surroundings and attract a mate so how is this possible? The octopuses have a weird pupil in the shape of a "W" and "U" which allows it to see color using chromatic aberration. Their vision is blurry and some colors are easier to pick up on(blue and yellow) while others are harder(white/light colors). Although they only have one photoreceptor it is beneficial to them because it allows them to see in dim lighting and tell colors apart.

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

cuttlefish, squid and octopus pupils

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