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View looking west at the major room of the interior of the Sacellum (chapel) of the Augustales (priests in charge of Emperor Worship).
This is a large space with a central nave and two side aisles. The four columns outline the central nave and above is was a clerestory that let in outside sun light. Directly ahead, on the west side is the central shrine where a statue, or bust, of the emperor was venerated. See following images for important details.
In the foreground there are two square pedestals attached to the columns. On them stood statues of prominent priests that served the imperial cult (=Augustales).