Abstractist alternatives follow a well-worn path in aesthetics (Kivy 1983; Dodd 2007; critics include S. Davies 1991; Trivedi 2002; Kania 2008; D. Davies 2009) and accommodate an expansive architectural domain that includes historical, fantasy, and unbuilt works. Per classic Platonism, abstractism allows identification of an architectural object and concrete counterparts—including multiple replicas—by reference to a single, fixed, and unchanging background source of what real world structures (or fantasy structures) are and should look like.