It’s fascinating to me, the interaction of light and matter. The way we, as people, perceive things is literally colored by the sensitivities of our eyes to certain wavelengths of light. How can we ever be certain that what we see is what another person sees? Add to that the complexities of trying to make a camera capture what we see and a computer monitor or printer ink display it correctly and the problem of color and correctness becomes monumentally impossible to solve.
If we take away that color and render everything in grayscale we arrive at a medium. Grays are nothing but an equal combination of all colors in equal amounts. We’ve taken away one dimension and by doing so we can see things more clearly.
Minerals deposited in striations of brown become topographical maps of the passage of time over their surface. Rocks become the ancient bones of the earth.