It may only be the Law of the Owl*.
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It may be the First Corollary**. I’m not sure. But I can say: I am embarrassed.
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But, as TechNoir said (paraphrased): The Muggles have no idea and the Knitters have all done it themselves. Why be embarrassed?
p.s. I have plans for this stuff.
*Law of the Owl (paraphrased): Yarn is purchased in inverse quantities to the amount of time available to knit.
**Law of the Owl, First Corollary: Yarn is purchased in quantities directly proportional to stress.