Kuala Lampur, April 16 -- Work, classes, meetings, site visits, and the occasional quiet moment at my desk. Much of my day is spent indoors. Like most people, I move from one building to another without thinking too much about it.

Lecture halls, offices, lifts, corridors. They are simply part of the routine. But every now and then, I notice something. A room that feels heavier than it should. Air that seems to linger a little too long. A space that looks perfectly fine, but does not quite feel right. You tell yourself it is just fatigue. Or maybe the weather. Or perhaps you just need coffee. And then you move to another building, and somehow, you feel better. It is easy to dismiss these things. Most of us do.

Over time, however, I have ...