Bacon also explores the growth of cities from early Greek and Roman times to Philadelphia's design in the 1960s.

[2] Bacon points to akroterion of Greek temples as an excellent example of how buildings and built form meet the sky.

He argues great places have prominent points in space that are identifiable work to interplay with other elements.

Designing in depth creates urban movement, that allows space to be understood from multiple perspectives.

Working with the depth of built form, convexity and concavity act as connector and divider of urban space.

One of the most critical pieces of Bacon's work is the identification and reiteration of built forms relationship to man.