[...] Consider this analogy: you are tasked with measuring different lengths of timber. You start with a piece of string, stretching it from one end to another, and then measuring it off against a ruler. Then you swap to an old ruler with Imperial measurements. Later, you graduate to a metric ruler, but it only marks off at 5mm intervals. Finally, you make the last measurements with a high-grade steel ruler marked off at half-millimetre increments.