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Close horizontal view of the lower portion, depicting central convex between the straight outer bays (note how the four central columns appear pushed into the surface of the façade like stone into clay); SS Luca e Martina (the church of the painter's guild Accademia di S Luca in Rome) is planned as a Greek cross with apsidal endings and a dome over the crossing, set on a drum. The internal wall surface is vigorously articulated with pilasters and paired free-standing columns recessed under a continuous entablature, recalling Michelangelo's usage at the Biblioteca Laurenziana in Florence. The lower storey of the façade is structured in the same way, with engaged columns and projecting pilasters. In both storeys of the façade the wall describes a gentle convex curve between the central bay and the coupled pilasters at the sides: thus a main theme of Baroque church façade design appeared in Rome. Source: Grove Art Online; http://www.groveart.com/ (accessed 11/5/2007)