Measured in sustained attention per unit time. Degrades with distance. Amplifiable through deliberate acts of presence.
The degree to which two signals align. When coherent, outputs are constructive. When incoherent, destructive interference produces silence.
Every signal carries overtones the sender did not intend. The receiver's perception includes frequencies the source cannot measure.
The ambient level of miscommunication below which signals cannot be distinguished from static. Reducible but never eliminable.
Mean Time Between Failures. Not a prediction but a statistic. Every unit fails. The metric measures how long care sustains function.
This is the underside of the board -- where the connections are made, where the copper meets the tin, where the heat was applied. The component side is the public interface: labeled, organized, comprehensible. The solder side is the private implementation: functional, imperfect, honest.
Every relationship has a solder side. The moments that do not appear in the documentation. The rework, the patching, the joints that were reflowed at three in the morning because they failed under stress and someone cared enough to fix them.