Since I was born colorblind, I've never actually seen the color red. With some testing Erin tells me that what I perceive as red, she would label as gray. You can find some pictures that can help you see colors the way I do here:
Vischeck: About Daltonize
The two fruit pictures look essentially identical to me.
So what does red actually look like? How would you describe red? If I were to close my eyes and try to imagine red, how would I do that?
Have you ever been able to visualize a color you've never seen? For example, can you imagine what ultraviolet or infrared might look like if your eyes could perceive a broader part of the light spectrum? How would infrared look different from red?