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Wear marks on a belt are like rings on a tree.
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
After two days I finally get that you're not talking about non existent rings around the belt holes but are talking about the darker buckle lines on the belt that are inbetween the belt holes.