Thermal information is not differentiated in our memory; rather it is retained as a quality, or underlying tone, associated with the whole experience of the place. It contributes to our sense of the particular personality, or spirit, that we identify with that place. In remembering the spirit of a place, we can anticipate that if we return, we will have the same sense of comfort or relaxation as before.
There is an underlying assumption that the best thermal environment never needs to be noticed, and that once an objectively "comfortable" thermal environment has been provided, all of our thermal needs will have been met. The use of all of our extremely sophisticated environmental control systems is directed to this one end—to produce standard comfort zone conditions.
Textbooks on water-system engineering state that supply mains are generally installed on the north side of the street in the Northern Hemisphere and on the south side in the Southern Hemisphere, so that the sun will warm them. In both hemispheres they are supposed to be on the east side of north-south streets, on the premise that the afternoon sun is warmer than the morning sun.
The predicted mean vote (PMV) was developed by Povl Ole Fanger at Kansas State University and the Technical University of Denmark as an empirical fit to the human sensation of thermal comfort. It was later adopted as an ISO standard. It predicts the average vote of a large group of people on the a seven-point thermal sensation scale where:
[Andy Crouch] quotes the Japanese theologian Kosuke Koyama saying that “the speed of God” is three miles an hour because that was the speed at which Jesus moved through his world. So maybe, and I think this is one of the chief burdens of Andy’s book, what makes the most sense for us is to try whenever possible to move at the speed of God – and in that way refuse the offer of superpowers.
Of course, this dovetails with a lot of things people have been writing lately about slowness, but what I like about Andy’s book is that it specifies why we can find ourselves responding so warmly to the possibility of slowness. What happens when we seek superpowers, and especially super-speed, is the sacrifice of what I want to call our proper powers – the powers through the exercise of which we (heart-soul-mind-strength) flourish in love.