I’ve been poring over the Database recently, looking for patterns. Based on this and the combined experience of other Hum hearers, I am increasingly convinced that the shapes of buildings and their resonance has nothing at all to do with the world-wide Hum. The acoustic properties of individual rooms, however, may affect what a hearer perceives.
For those of us who are convinced that the shape of a building plays a significant role in the Hum, then perhaps try this experiment: wait until you have an evening when the Hum is loud or at least at typical levels, and then get in your car and drive to any location that has low ambient noise (out into the country, a very large park, whatever). Park with the windows closed, engine off, and then listen. I’ve tried this experiment a number of times and whether in a car, van, or truck, the Hum is the same as it is in my house. Good numbers of hearers report the same results. You could then repeat this but in a very large and quiet building.
I never discount the personal experiences of other hearers, but I encourage everyone – and myself – to question what we are sure of, to be open to the possibility that some of our initial assumptions and observations may not be correct.