Featherspear Pin
This ash-shafted pin features a spearhead carved from jade in a shape suggestive of a quill feather; whatever it is pinned through slowly grows a pale pink-gray mold.
This work was deposited anonymously at our archway, I discovered the effect by simple experimentation: whatever material this pin pierces becomes weightless as the mold grows over it, though it seems not to harm the material.