In Love by the Numbers Helena Dettmer suggests that poem 17, which begins o Colonia, quae cupis ponte ludere longo, belongs to a disparate group of poems within the Catullan corpus, which contains poems with personified inanimate objects. Yet two of that larger group, poem 17 and poem 67 (addressed to a house door or ianua), are more closely drawn together by their settings, which the author hints are northern and specific while leaving them undefined and general. Furthermore, the two represent personified wooden objects, a bridge (poem 17) and a door (poem 67), while the broader group of poems includes personified estates and poetry. Finally, the metre of poem 17 is unique within the Catullan corpus. It sets the poem apart from the others and assists in defining its character.