On Christmas Eve 1862, at the Royal Polytechnic Institute, in London, the Institute’s director, John Henry Pepper, debuted his theatrical refinement of a reflection illusion that came to be known as “Pepper’s ghost.”

The sensation had made it to the United States by the early 1870s — probably initially being performed as a sideshow attraction.

But, on the evening of 26 December 1879, the resident company of the Metropolitan Theater in Sacramento, Calif., used what they called “the Pepper Mystery” to dramatize the Emperor Norton.

It was a commonplace in the 1860s and ‘70s for theater troupes in San Francisco and elsewhere in California to burlesque the Emperor for laughs. But, it seems as though this performance might have been a little different.

Did members of the audience at the Metropolitan all slap their knees at the sight of an ethereal Emperor Norton on the stage? Or did some shed a quiet tear for the passing of an era that too quickly was slipping through their fingers?