Two hours of nature per week are enough for a measurable health effect. Below that nothing happens. Most cities are built as if nobody knew.

In 1991 Ulrich measured how long the body takes to respond to nature. Four to seven minutes. Not the brain. The body. Heart rate, blood pressure, muscle tension.

There are thousands of studies on how buildings and cities affect people. The knowledge isn't missing. It's invisible. Photography can change that.

100 lux more daylight shortens a hospital stay by 7.3 hours. Data like this exists for nearly every building type. Almost nobody uses it.

We spend 90 percent of our lives inside buildings. The construction industry thinks in square meters and returns. The person inside is a usage assumption in a spreadsheet.