Immaterial Architectures.

Since its invention, electric lighting has had a decisive impact on the psychogeography of urban space. Concentrating on the period from 1880 to World War II, the author argues that electrical lighting has been a major factor in the emergence of modern urban environments, in which the traditional function of architecture as a stable ground has increasingly given way to a growing mutability of forms and fluidity of appearances. This tendency both paralleled and converged with the effects of modern media technologies such as cinema, contributing to the emergence of a new environment characterized by "relational space," in which the city is increasingly defined by the overlap of material and immaterial spatial regimes. [ABSTRACT FROM AUTHOR]