it's interesting, when doing world building, to just find a thread and get curious about it, to follow it and see where it leads. in my experience, most questions are only three or four steps away from staring at the abyss of embodied existence (positive). it's great to find ways to weave this in.

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but if you could see polarized light, it might be quite interesting! especially knowing beings who can't see it found meaning it it too. so the human potters might end up doing active trade with some arthropods downriver, and modifying traditional patterns...

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crows are black to humans, and are associated with other black things. but crows are actually not flat black- and this is much more apparent if you can see UV frequencies. so species (like crows!) which can see some UV light might have very different sets of ideas associated with crows.

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purple is our one human gap color (101 in rgb) because we are (mostly) trichromats. but if you had a fourth receptor you would have three gap colors (1010, 0101, 1001), and you would have two tripod gap colors (1101, 1011). cultures have differing name systems and associations for all these!

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you can actually affect polarization with different materials, eg scattered light in our sky is polarized, and light which bounces off of water is polarized. so maybe you can use this in decorative art? linearly polarized red patches on a shield next to unpolarized red? that could be interesting.

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