While the "spin it around" explanation is useful at a certain level, this "basis understanding" is useful in a different domain - quantum physics. Position and

While the "spin it around" explanation is useful at a certain level, this "basis understanding" is useful in a different domain - quantum physics. Position and momentum are two such dual bases, as are energy and time. In other words, time and energy (for example) are perspectives. If you try to narrow a signal from one perspective, it will look spread out from the other perspective.