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"Colors do not exist outside the brain"
False. It does exist. Right now you are seeing a bunch of colors that are outside and around you.

"They can't be measured. Objects do not have color."
Color is a result of the object interacting with light.

"Electrons don't have color"
Electrons have absolutely nothing to do with colors at ALL.

"And when we look at an object all we see are photons"
Hmm, lemme see, NO, we see color. :)

"There is no color in that electrical signal."
NO SHIT SHERLOCK :O
electrical signals only makes us perceive (UNDERSTANSD) the color which is outside of us.
Colour blindness PROVES IT. And you can't do anything about it.

"Our eyes do not create color"
NO SHIT SHERLOCK :O
Color is not created in your eye, dumb****. it is created in light interacting with an object.

"they only generate an electrical signal"
false;

"The colored cones in our eyes"
cones are not colored, but they do perceive color.

"People evolved color vision because it makes it easier for us to tell the difference between different objects"
False, the very fact that planets over a ridiculo distance do possess color, already discards this false possibility, people do not "evolved" for any of this nonsense.

"There is no way to know if the color you see as red is the same color I see as red."
Yes, there is. apple is red, and If you have good eyes, you see exactly as it is, despite the fact that our cones can differ, and we may see in diff shades of red, but the apple still red.

"Someday, we may be able to ensure we all see the same the same color when we look at an object. But that day is long off. "
There is no "someday", you are talking a bunch of gibberish.

"Everything we see is virtual reality"
sci-fi nonsense. This isn't matrix. wake the fuck up idiot.

"created by our brain"
The only thing created by your brain is your mind and your own consciousness (which itself is IN reality, which is not matrix, nor is a dream)

"based on our sensory input taken from the real universe around us"
Yes, there is a real room around us, and our senses detect exactly as it is. That's why we know how to differ hallucination from drugs (mental creation of our subjective mind) from REAL REALITY around us that we perceive with our senses (light, color, shapes, objects, etc)

"PEOPLE can see color even if they have no eyeballs."
If the person already saw before, yes, they can imagine colors and even dream in colors.

"Some people dream in color."
Blind people from birth cannot dream in color.