What Is the Relationship Between Form and Color?

There is a saying that form or shape and color, there's one word in Chinese that means really both shape and color. And this, and this are said to be identical. Space or emptiness is precisely shape color. And shape color is precisely emptiness. This is actually a Buddhist saying from the tridhaya sutra. These are never felt as alternatives or things that are in some kind of contest. So then when it is said that there is not any thinker behind thoughts, not any experiencer who has experiences, this is a way of saying that experiencing, knowing, is not an encounter between strangers.