The mention quote said by Plato..
He said that oh my God! Iam ruined
A shadow is a concrete noun, because like light (a form of energy), and darkness (absence of light) it can be seen. It is not an intangible concept which is the definition of an abstract noun.
The use of the term shadow, in this context, metaphorically refers to something that is not seen, due to the absence of light. Shadows conceal. So this would be a secret campaign.
Penumbra is a partial outer shadow that is lighter than the darker inner shadow umbra (e.g. the area between complete darkness and complete light in an eclipse). It is a fringe section of half shadow resulting from the partial obstruction of light by an opaque object. U.S Government: The idea that people have other rights in addition to the ones listed in the Bill of Rights ~ Apex
God's Light
The phrase "Light is the shadow of God" is often attributed to the poet Rumi. It reflects the idea that light is a symbol of divine presence and illumination.
light+darkness
Supposedly God said "Let there be light"
A shadow is the absence of light and the absence of light is usually said to be black.
God said let there be light
God said "Let there be light," and there it was.
Genesis 1:3 God said, "Let there be light," and there was light
Gen:1:3: And God said, Let there be light: and there was light.
light did not had shadow and will not have shadow.
Due to light hitting the object, and said object obscures the light from reaching the other source, therefore, it is, as is darkness, an absense of light. Hope this helps.
Black God's Shadow was created in 1977.
Because God said, "Let there be light!"