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hmmm
(lemmy.dbzer0.com)
For things that are "hmmm".
Rule 1: All post titles except for meta posts should be just plain "hmmm" and nothing else, no emotes, no capitalisation, no extending it to "hmmmm" etc.
Lots of revetments for water control in South Florida were built like this in the past. The burlap sacks all eroded away and leave an interesting pattern like you mentioned.