Advent illumination stands in line with Platon's idea, Buddha's speculation and understanding within, revelations with illumination within and Bacon's images on the screen in a cavern.

Decartes was dreaming in front of a fireplace when the three schemata were understood.
Allegedly, stumps also were used as a projection box.
Natural lights were used through eyes peeping into the air.
Now electric waves are used in place of it, completely hidden.