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"He (the Ynca) had a great vase of gold containing Chicha. It was received by the priest, who emptied it into the urn which, as has been said, is like a stone fountain plated with gold. This urn had a hole made in such a
way that the Chicha could enter a pipe or sewer passing under the ground to the houses of the Sun, the thunder, and the Creator."
"THE TEMPLE OF THE ANDES" RICHARD INWARDS 1884
A possibility but still can't explain how a hole of that shape was produced.