Ruth Mordecai exhibit and Paul Dietrich Gallery await discovery inside a Harvard hotel complex

Paul Dietrich Gallery Works by Ruth Mordecai on display in CambridgeSeven’s Paul Dietrich Gallery in Cambridge’s Harvard Square.

There has always been art beholden to the wealthy and corporate – see Michelangelo and the Medicis. In Somerville’s Davis Square, a CVS provides a window space for display; in Cambridge’s Harvard Square there’s a “25/8 artspace” window owed to zoning that keeps Santander Bank from taking up too much sidewalk. (The bank lurks immediately behind the art.) No one had to force the architecture and design firm CambridgeSeven to host a gallery, though. It was established in 1999 by a partner of the firm and is open to the public during business hours in the office part of Harvard Square’s Charles Hotel. (The complex is a good spelunk; it also hosts Pronto , a gem