Shoji are Japanese screens made with a wood frame and panes of translucent paper. Japanese shoji are used as windows, doors and room dividers. In this interior, it allows natural diffused light into rooms while providing privacy.
Geisha 1910 - a maiko and her older sister sit for a photo. The maiko who is standing is making her debut, the two silver flutters are signal to that. Onesan means "older sister", they weren't actually sisters. The older one was a mentor to the younger apprentice and taught her everything she needded to know.