A shawl that has been worn in the wintertime for years had a small hole which had begun to widen.
In the evening darned it, weaving fine wool yarn across the gap. The next morning examined the shawl by daylight. Spread it wide. Turned it over. Was unable to find the mend. It was as though it had healed. Ludicrous. But it did take awhile to find it.
There's an economy to fixing things and an environmental advantage to preserving rather than discarding. What is it about mending that is so satisfying? There are benefits beyond the practical.