From the Wikipedia Commons.

Life is often represented as Light.
As in, “Then there was light.”
Or photographs of a dewy leaf bathed in sunlight. But it’s not the light that gives light, as much as the chlorophyll that transforms light into food.

Guess what?
Chlorophyll is comprised mostly of carbon atoms.

Carbon — literally — is the building block of life.
And it’s intrinsically tied to light: Carbon reflects light (as diamonds), creates light (and electricity, as the primary element in the hydrocarbons coal and petroleum), and absorbs light (charcoal, a result of the release of energy and light in a fire).