As for why the rudimentary compass was in the shape of a spoon, Silverman says the original diviners may have made the ladle shape to mimic the Big Dipper. In that constellation, the two stars at the end of the “bowl” point to the North Star. And since the spoon’s neck pointed south, that meant its bowl pointed north

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Substrate (biology) (Wikipedia) In biology, a substrate is the surface on which an organism (such as a plant, fungus, or animal) lives. A substrate can include biotic or abiotic materials and animals. For example, encrusting algae that lives on a rock (its substrate) can be itself a substrate for an animal that lives on top of the algae. Inert substrates are used as growing support materials in the hydroponic cultivation of plants. In biology substrates are often activated by the nanoscopic process of substrate presentation.

The South Pointing Spoon (hakaimagazine.com) On a bronze plate, the little metal spoon balances exquisitely on its bowl. Each time it’s tossed or spun, it comes to rest with its neck aiming south. This is a replica of the aptly named south pointing spoon, thought to be the first magnetized object ever used to tell direction. And it was the crucial precursor to the magnetic compass, one of the most important inventions in maritime history.