I was once asked at a University PPE interview, Does time have a colour? I found it both extremely interesting and baffling. My opinion was that as time was not a physical property it could not have a colour yet I questioned myself countless times. What's your opinion - could time have a colour?
The word 'color' has three meanings, as far as I can tell: 1, certain properties of atoms and molecules that make them emit electromagnetic radiation in the so-called visible range; 2, mixtures of frequencies of this electromagnetic radiation that go to the eye of the observer and produce an image on his/hers retina; and 3, sensations of color that this observer experiences. So if I am looking at a green leaf, which of these three meanings of 'green' am I experiencing?
I am having trouble with secondary qualities, which are manufactured in the brain after receipt of digital signals from the sense organs. For example, if I see a green leaf, I know that chlorphyll molecules in the leaf transmit electromagnetic radiation of a frequency such as to produce a sensation of green in my brain. The problem is that all the empirical objects that I perceive are structures of secondary qualities, and these are all outside my head. So where are secondary qualities, inside my head, or outside?
The color of something is the color of the spectrum that isn't taken in by an object. However when I look at the color "green", do I see the same tint someone sees when they see "blue"? The identification of a color is what we've been told, and we've essentially been told what colors don't go good together. So how do we know that all of our eyes see the same thing?
How can we be sure that we perceive color the same way? In other words, how do I know that the red I see looks the same as the red that you see?
We are taught from birth to identify red objects as red, but what if what someone calls red really looks green for example, yet they only call it red because that is what has been taught?