Researching in the archives of the British film company Ilford, University of Liverpool scholar Michelle Henning came across a memo pasted into an experiment book by one of the company's chemists. Dated January 19 1923, it instructed that "in future, coating of any kind of emulsion must not be commenced or proceeded with during a fog." London's chemical laden fogs, which persisted into the 1950s, reacted with Ilford's film emulsion, producing (ironically) what is known as photographic fogging of images. Writing recently at The Conversation, Henning describes how British press photographers nonetheless made the most of London's gog, creating seductively beautiful images that failed to communicate a deadly environmental problem.

  If a neighborhood's memory is held in its creative spaces, then East Harlem is currently a vivid, breathing archive. This weekend, the East Harlem Open Studios (EHOS) returns, transforming private workrooms into public forums for conversation and discovery. From 1:00 PM to 6:00 PM on Saturday and Sunday, more than 25 artists and galleries invite you to see the "marks we leave in the world"—those stories about how they navigate the messy creative process that bri...