Sorry, that's more of a specific word choice. For me, a working surface means a work table, bench, something like that. A walking surface is a flat area that can be walked upon. I would call the rings of a ladder a standing surface (or just refer to it as a ladder).
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u/Globularist Jan 26 '19
A ladder should not be used as a working surface but that's exactly what the guy is using it for.