We don’t really. We have three receptors that respond to different wavelengths (plus black and white) and our brains stitch together a composite image.
Animals can have fewer or more receptors, and see more or fewer colours. Just like a person who is red-green colourblind, and sees them as the ‘same’, some animals and even rare people can see different colours where we see only one. We are all effectively colourblind to some extent.
We don’t really. We have three receptors that respond to different wavelengths (plus black and white) and our brains stitch together a composite image.
Animals can have fewer or more receptors, and see more or fewer colours. Just like a person who is red-green colourblind, and sees them as the ‘same’, some animals and even rare people can see different colours where we see only one. We are all effectively colourblind to some extent.