Express Image.

"Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high;" (Heb 1:3)

[Photography ...is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either chemically by means of a light-sensitive material such as photographic film, or electronically by means of an image sensor.^[1] Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure. The result in an electronic image sensor is an electrical charge at each pixel, which is electronically processed and stored in a digital image file for subsequent display or processing.] - Wikipedia. 

The Living Photograph.

No wonder the pharisees and sadducees couldn't understand the Creator of science and the whole universe. He taught astronomic and rocket science to the unschooled. When John gave his scientific facts in John 1:1-14, that God was made manifest in Christ, many taught he was dumb and stupid, not knowing he (John, and the rest of the saints) was and is one of the best minds in science of his days, even till now to ever walk this earth!

Here's what Apostle John said concerning Christ, the "express image" or the "living photograph" of God in John 1:1-18:

"No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him." (vs 18) ... and "He was in the world, and the world was made by him, and the world knew him not." (vs 10)..."And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth." (vs 14). 

... and so the scientist continued:

"In the beginning was the Word (Gen 1 & 2), and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. In him was life (the Spirit/Breath); and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not." (vs 1-5)

Bear True Witness.

"There was a man sent from God, whose name was John. The same came for a witness, to bear witness of the Light, that all men through him might believe. He was not that Light, but was sent to bear witness of that Light. That was the true Light, which lighteth every man that cometh into the world." (vs 6-9)

God is a Spirit, and He manifest Himself through His Light. He is the Creator that created everything - seen and unseen. All of His creation is made to reflect Him as His light shines on them. When His light is allowed to shine and remain over people or things, His life is infused into them. To say all in one sentence: the revelation of the Word of God births the fire that brings light that gives life. Out from what He created, God formed a Body for Himself to show us Himself. It's a mystery still to those in the dark.