In their basic form, mithraea were entirely different from the temples and shrines of other cults. In the standard pattern of Roman religious precincts, the temple building functioned as a house for the god, who was intended to be able to view, through the opened doors and columnar portico, sacrificial worship being offered on an altar set in an open courtyard—potentially accessible not only to initiates of the cult, but also to "colitores" or non-initiated worshippers. Mithraea were the antithesis of this.