Comparators and metaphors

I’m constantly amazed at the use of some quite random objects as comparators typically when describing size and scale. You know the sort of thing, “it’s the equivalent of two ‘Olympic’ size swimming pools”, or “it’s the length of 10 double decker buses parked end to end”. I’m not entirely sure that these references are at all helpful, as how many of us could visualise and compare something to the size of a swimming pool, let alone an ‘Olympic’ size swimming pool which is traditionally longer, and their scarcity probably means less people have actually seen one! We rarely see a double-decker bus in our area anymore, but if we did then it would apparently take 470 of them to fill the deck of the new aircraft carrier that’s being built for the Royal Navy! I get the point of contextualising what is being described but the comparator should make it easier to visualise and understand and not worse.

A similar thing happens with metaphors (i.e. a thing regarded as representative or symbolic of something else). Carol Kirkwood (BBC Breakfast Weather presenter) prefaces any Met Office weather warning when using the red, green, and amber traffic light metaphor as a proxy for the severity of the weather, but then completely devalues the benefit afforded by the use of this metaphor by having to describe that the ‘Amber’ warning is one step up from the ‘Green’ warning, yet not a severe as the ‘Red’ warning.