For instance, I suffer from a moderately rare eye condition. I will go blind for 3+ hours if I'm exposed to bright light for more than a few minutes. It's like a goths wet dream. When it first happened I was probably 12 or so, and the whole time I sepnt trying to think what blind people saw suddenly made sense.
They don't see anything. Not black, nothing.
This particular topic in regards to what a blind person "sees" is a fascinating one. If you ask the average person on the street what blind people "see", they will probably say "nothing but blackness". Those were my thoughts as well until I realized many years ago that truly blind people do not see any "color" whatsoever. They do not see anything. The absence of sight is not the color black.
Just to be clear, there are many different variations of being "blind". I, myself, am "legally" blind without any contacts or glasses, but can see 20-20 otherwise. I see plenty of blurry colors even without my glasses. For the purposes of this discussion, "blind" refers to those people who do not receive any input whatsoever through their eyes (or optic nerves, etc).
My hypothesis is that blind people do not have a curtain of blackness preceding their paths. There is absolutely nothing at all. You might think that blind people do have a black curtain eternally draped in front of them, but they just cannot relate that experience to others, because they have no color-point-of-reference. That thinking would be wrong.
Imagine a new race of alien, called the Mucola, who have a seventh sense (I'll skip six for fun
The Mucola call the "there is no gravy around" tick "fubar", and call the "there is gravy within my reach" tick "yumyum". From "fubar" to "yumyum" are dozens or maybe hundreds of other degrees of ticks: "dork", "nerd", "geek", etc.
Nearly all the Mucola share this spectrum of tick words, with the exception of the Mucola who lost their GravyTicker in gravy-raiding battles. Those Mucola can remember what it was like to tick "fubar" or "yumyum", but now the ticking has completely stopped, and they tick nothing. Many of these Mucola quickly die, but some learn to find gravy using nothing but their senses of sight, hearing, smell, feeling, and taste.
What do you tick?