This paper seeks to respond to two questions posed by previous commentators concerning the arrangement of Trimalchio's porticus as described in Petronius’ Satyrica (Sat. 29): first, whether the freedman's house lacked an atrium; second, whether the cursores (runners) who are described as unconventionally exercising in the portico were pictorial representations or real-life athletes who would symbolize the social incompetence of the dominus. This paper argues that nothing in the text supports the interpretation of Trimalchio's house as having an unconventional architectural (...) layout. Instead, as the narrative requires that Encolpius move quickly towards the triclinium, in his description the loca communia appear conflated, while he only sparsely notices a few relevant elements of the decor. The presentation of Trimalchio's porticus appears to have a functional rather than a simply descriptive purpose: it symbolizes both Roman contemporary practices (the loca communia as a distinctive unit within the domus) and the influence of Greek cultural habits (the characteristic association of colonnaded courtyards and athletics). The excerpt that describes the guests’ arrival at Trimalchio's house, therefore, serves an important narrative function, providing essential information about the character's origins, self-image and social life. (shrink)