The mind and the eyes

Always wondered if everyone sees in precisely the same way. As a metaphor, of course we don't - we have different opinions, different perspectives of life's events because of our different experiences.

But physically (and leaving to the side people with color-blindness!) - does everyone see the same red flower that I do? Or does someone see 'yellow' when I see 'red'? The same wavelengths of light hit our eyes in the same way, I suppose, but the nervous system or the brain can do peculiar things.

And the incredible thing, to me, is, that there seems to be no real way of knowing what other people see, metaphorically or physically.