The hunter-gatherer sensory conditions your biology was built for.
For 200,000 years, humans lived in environments their biology shaped and was shaped by. Moving water. Living soil. Varied terrain. Dappled light. Food within reach. Seasonal rhythm. Sky access. Acoustic richness.
These weren't amenities. They were the operating conditions of human neurobiology. Remove them — as modern built environments systematically do — and you remove the conditions under which human biology performs at baseline.
The Noon Baseline is not an aesthetic standard. It is a biological specification. It defines the sensory conditions a property must deliver for the human occupying it to function at biological baseline.