You take a seat in the porch swing and put your feet up. While not exactly comfortable, there is something soothing about the gentle rocking, as though the effects of gravity have been subdued. Time seems to slide away from you as you study the houses on the other side of the street, bathed in the fading sunlight. It would be a lovely scene were it not so quiet - no people, no dogs, no birds, very little sound at all. You would swear that none of this was real.
Your eyes drift to one of the supports next to you. Someone has carved something into the wood at just about eye level: "R=7"