Sociology 101, Nonverbal Communication, and Design Anthropology courses frequently list Man Watching as a secondary text. Students, under financial pressure, often search for the PDF before buying a physical import.

Manwatching : a field guide to human behavior - Internet Archive

A major section of the book explores how humans manage the "invisible bubbles" of space around them. Distance Zones : Morris identifies four primary zones: (up to 18 inches), (1.5 to 4 feet), (4 to 12 feet), and (over 12 feet). Territorial Behaviour

Morris, a world-renowned zoologist, treats humans like a fascinating species at the zoo. He breaks down: : How we signal our bonds to others in public.