C654 Feng Yi(2)

What is the shadow of light?

It is not a shadow, but the shadow of an object when it cannot be illuminated

In this case, the so-called shadow is a state of being when light is not and is blocked;

The source of light, the object's reference, equivalent, and barrier, when the source is blocked, the only thing left behind is the shadow;

What kind of understanding would this source and its