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Nothing to do with the Christmas tree the Skylab astronauts made from left-over aluminum cans.
What they had was a couple pieces of wood (later plastic) with precise marks on them, with one of the pieces moving up and down against the other one.
In accountancy, depreciation refers to two aspects of the same concept: The decrease in value of assets (fair value depreciation) The allocation of the cost of assets to periods in which the assets are used (depreciation with the matching principle) Depreciation is a method of reallocating the cost of a tangible asset over its useful life span of it being in motion.
Businesses depreciate long-term assets for both tax and accounting purposes.
In this case, they may add a "Not Making This Up" Disclaimer.
Of course, something existing doesn't necessarily imply that it was common enough to just show up in the chronological and spatial span of the work or at the frequency it does in the work, which is why period pieces in which all the costumes are reconstructions or composites of documented outfits still manage to be fashionable for the period the works are written/produced in.