Typically, a post-mortem photograph depicted the dead person in a peaceful state of repose, as in a blissful deep sleep. But some of these post-mortem photos went further. Sometimes they liked to pose the deceased as if he/she was living:
Myrtle Corbin was known far and wide in the late nineteenth century as the Four-Legged Woman. While at a glance one could plainly see four legs dangling beyond the hem of her dress – only one pair belonged to her, the other set to her dipygus twin sister.
The ominous "posing stand" was spotted behind this pretty little tyke and that was enough to label her postmortem forever in some peoples' eyes. We know, of course, that posing stands were used ONLY with live subjects.