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The carvings depict the Persian army and we can see their military uniform attire. We see the glorious hats and their version of technology which was the spear, at the time that was the pinnacle of weaponry that an a shield for defense/protection from enemies. -
The bull represented power and strength of the Persians. The bulls are made out of composite giving it a look that makes it be of two colors. The bulls evoke power, as well as social political establishment, and set an identity for the Persians.