fullmetal alchemist series - Why do the eyes of a bounded soul

If I didn't miss one, all souls that were bound to armors have glowing eyes. Why do their eyes glow? It must somehow be connected to the bounded soul, as they stop glowing if the heads lose connec

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fullmetal alchemist series - Why do the eyes of a bounded soul

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fullmetal alchemist series - Why do the eyes of a bounded soul

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