axis
軸 — This school
One of five ways of putting the material in order.
Aegina Sea Turtle StaterCirca 600–500 BC
Athenian owlBC 454–404
Aureus of AugustusBC 27–AD 14
Chronological order (parts and chapters), cross-cutting themes, connections between people, actual coins, research methods — the same material can be followed from any of these five arrangements. ⚠ There are not five sets of materials. A single set of material has five coordinates.