A wooden object made out of 3 parts with a thin sheet metal sheet, a nail with a tied rope to it, and a hole surrounded with yet another thin metal sheet.

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Full article: A traditional wooden corbelled dome construction technique from Anatolia. The Eastern Anatolian Tandoor house with its wooden “swallow-dome” type of roof

Tree Fastening – How dangerous are Scews, Bolts and Nails?

Tree Fastening – How dangerous are Scews, Bolts and Nails?

We Built Our Own Easels, and You Can Too! (Maybe…) – Vitruvian Fine Art Studio

This metal cord dangling from a cellar ceiling. The metal is stiff but yielding and coated in clear plastic ending with a marble-sized ball. : r/whatisthisthing