You didn’t even mention what might be the weirdest thing about octopuses, which is that despite their colour changing abilities, current evidence suggests they can’t see in colour (Other Minds 2016).
They do not have the capacity to see color in the way we do, with different cells sensitive to different wavelengths of light.
Instead, they exploit chromatic aberration, by which different colors at the same focal distance require different lensing to focus on the retina. By knowing how far away something is and seeing how sharp versus blurry it is at slightly different eye-focuses they can know how bright it is at different wavelengths.
You didn’t even mention what might be the weirdest thing about octopuses, which is that despite their colour changing abilities, current evidence suggests they can’t see in colour (Other Minds 2016).
They can’t see color, or their eyes can’t see color?
They do not have the capacity to see color in the way we do, with different cells sensitive to different wavelengths of light.
Instead, they exploit chromatic aberration, by which different colors at the same focal distance require different lensing to focus on the retina. By knowing how far away something is and seeing how sharp versus blurry it is at slightly different eye-focuses they can know how bright it is at different wavelengths.