At first sight?

If with our other senses, be it tastes, feeling, sound, each individual interprets his or her own angle of that sense, why is it, then, people hesitate to assume that sight is the exact same way. How do we know if your “red” is not my “green”, and so on. We can never see through anothers eyes, so how can we say that there really is something called “green.”

One fish, two fish
Redfish, Blue fish\

Nooch.

They do. Philosophers have been wondering about it for centuries - it’s an important part of metaphysics. John Locke devoted quite a lot of time to discussing the properties of colours, if you fancy looking into that area more. And i would venture to say that almost everyone has considered this at some point.

Fran

And from the other perspective, we know can measure light and accurately quantify it. We know that light at a certain frequency is bright red and that every time any two people see that frequency they call it red. It reacts with the same type of receptors in both people’s eyes etc. So whether the two brains perceive it as being true ‘red’ is a matter for philosophy since it could never be proven in any way that I can think of. You call it red and acknowledge it as a ‘warm’ colour, I call it red and acknowledge it as a warm colour. It’s red.
Of course this ignores the fact that most people have varying degree of colour blindness and really don’t differentiate all colours the same way.