I think it's the DOME, hope this helps
Answer:
A hub for the arts and philosophy during Antiquity, Athens was the home of Plato's Academy and Aristotle's Lyceum. The city was also the birthplace of Socrates, Pericles, and Sophocles among many other prominent philosophers, writers and politicians.
The Ancient Athenians were peaceful, they enjoyed the systematic study of subjects such as science, philosophy, and history. They also loved art, architecture and literature, and they created thousands of temples, statues, paintings and texts.
Paper, books or canvases of sorts are labeled in size with A1, A2, A3 etc (the bigger the number the smaller the object) a4 paper is the standard size
