I know that I have hazel eyes: a combination of the colors green, blue, grey, and yellow. I actually know that I have eyes that are made up of pixels, no, waves of light that are reflected in certain ways that appear as the color “hazel”.
I know this. I know that I know this because when I look in the mirror, my eyes reflect back to me the color that we call “hazel”. Also, when others look at my eyes, they tell me what they see: the color “hazel”. I know this. I know that I know this based off the only means that I have to know things: what I see with my eyes and what others see with theirs.