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[Koen G]

Yeah exactly. Think of traffic signs, a white triangle with a red border. It would mean nothing 200 years ago, but to us its meaning is quite powerful  and immediate.

I missed the essence of the top part in my first post. It's really about blood and water. If the mandorla is the wound, you can almost feel the water splashing over its edge and about to fall into the cup. It's a fantastic drawing once everything clicks.