Hydromancy

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What Wikipedia says

Hydromancy (Ancient Greek ὑδρομαντεία, water-divination, from ὕδωρ, water, and μαντεία, divination) is a method of divination by means of water, including the color, ebb and flow, or ripples produced by pebbles dropped in a pool.

Excerpt from the Wikipedia article “Hydromancy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Roger McLassus, CC BY-SA 3.0, via Wikimedia Commons.