Here are two paintings of my dogs. Fig Newton the collie and Maggie the hound . I painted these and am showing them here because they illustrate how the color of black can appear white when it is in direct sunlight. The opposite is also true,a white object can appear quite gray or almost black in the shade.
These tricks that the light plays on surfaces are what interests me the most about painting. How can you observe these relationships and translate them into value shapes? I think that is what the visual arts are about. It is about creating illusion. That's the magic!
What I have learned so far:
To establish the relationships it is necessary to squint until you can see relative shapes not surfaces. This makes your face hurt but it is important to do. This is where as you age there is an advantage. Take your glasses off and establish the relationships no squinting needed.
I am a watercolor coach, watercolorist, and author.