How did the ostracon protect the community

Ostracon, potshard, or limestone flake used in antiquity, especially by the ancient Egyptians, Greeks, and Hebrews, as a surface for drawings or sketches, or as an alternative to papyrus for writing as well as for calculating accounts.

Explanation:

hmm.. that's be opened free elementary school for young boys who showed artistic potential. closed rome to outsiders to protect its unique style and methods of producing art. and employed scribes to copy latin and greek texts.