Graceland Cemetery is a catalog architectural graveyard typologies. From ossuaries and columbariums to mausoleums and monuments, each type has meaning, history and a specificity of form reserved for the dead. The cemetery becomes a site primed for architectural speculation.

The synthesis of twin forms as detailed in The Book of Forms resulted in +rivium: a new cemetery type accommodating the living and the dead underneath a coffered and tufted ceiling. +rivium occupies an intersection near the southern border of the cemetery, becoming a new contemplative stop on the walking path. Its triangular area posits a latent "third twin", a triad of composite dyads, manifesting at the place where three roads meeet.