Early last month, we ran Eadweard Muybridge's wonderful exterior photograph of the 1866 building of the Mechanics' Institute, where Emperor Norton spent many afternoons, wrote many proclamations and played many games of chess. But the more elusive prize has been a photograph(s) of the building's interior — of the physical spaces that Emperor Norton himself inhabited on all those afternoons, so many years ago.

Happily, we now can close this gap.