Invisible Geographies, an exhibition organized by critic Christophe Cox, presents four works that illuminate different facets of contemporary German sound art--a scene that has been tremendously influential since the 1970s. Aside from the national focus, what is unique about Invisible Geographies, amidst a wider burgeoning of sound art practice, are the diverse, large-scale installations of which it's comprised. Encompassing sculpture, video, light, and found objects, the four works by Jens Brand, Jan-Peter E.R. Sonntag, Stefan Rummel, and Christina Kubisch push far-flung edges of sound art's formal boundaries. They are linked by their common interest in physical or social dimensions of sound, and in their deft re-mapping of urban space. Kubisch presents three related projects under the heading 'New York Electrical Walk' that variously highlight, visualize and transform electro-magnetic sound waves the artist recorded in Times Square. A rough-hewn installation by Rummel made with found building materials and retired electronic equipment re-constitutes the space of the gallery according to its resident aural elements, putting echoes from hidden storage spaces in conversation with the humming of light fixtures. Gallery-goers can expect their senses will be re-tuned after a trip to Invisible Geographies, which will be reverberating at The Kitchen, in New York, through October 14th. - Lauren Cornell