The view from above (part 2)

[this is the second segment of a post started here]

It is no wonder that the earliest surviving architectural plan is that of the monastery of St Gall from the 9th century [link:http://www.e-codices.unifr.ch/en/searchresult/list/one/csg/1092]. Our sense of scale comes only in the 13th century and that of perspective much later.

Diagrams, however, abounded…