The Raumbilder photographic series depicts a sequence of imaginary interiors. Based on models created by the artist, the series pictures a constructed reality, yet is not a reflection of the lived reality, as one might think when approaching the medium of photography. Without any personal object or human presence for that matter, these images present a minimal composition of indoor environments. Rooms with few elements of furniture, mostly sofas and rugs, in neutral tones, white, gray, brown, black, where vanishing points created by hints of natural or artificial light leaping into the space through entrances, windows, mirrors with white or yellow light provide a heightened division between their interior and exterior, present on the one hand a more real and human dimension. Calculated and composed down with detail, generating fictional situations with a high degree of perfection, these imaginary and uncanny spaces are distinctive for a high level of interiority. When taking a closer look, we notice that some elements that make up the space, refer in their texture, to building materials of models, rather than to actual construction or interior decoration.

Ranner's concept of space touches upon the artistic visions of space during the late 19th and early 20th century, in which stairs, doors, and windows were transformed from functional spatial constructs into zones of transition into the unknown. Taking on the role of a voyeur, the spectator becomes an active player in the construction of the piece, which by its enigmatic nature, generates a feeling of suspension similar to the sensation of looking at thriller scene where anticipation combines with fear of revelation.