Concept
Version 4
Created by Boundless
Athenian Society
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Lightmatter_acropolis.jpg."
https://commons.wikimedia.org/wiki/File:Lightmatter_acropolis.jpg
Wikimedia
CC BY 1.0 Generic.