There you go, click on the pic for the three tweet answer, thanks.
Beware: this is not ‘top level’ thinking. This is a heuristic.
PS: I came up with all this a day after staring in to the sky whilst waiting for the morning minibus to Sony in Weybridge – and after tweeting about a strange line in the sky – by chance stumbled on the origin of the phrase ‘Occam’s Razor’ which is relevant to the design of heuristics: ”One should not increase, beyond what is necessary, the number of entities required to explain anything.”
The answer to my question – ‘Ockham Stack’ (see Q & A below with @CoxeyLoxey) – is named after the village in Surrey where William of Ockham, the guy who coined the phrase Occam’s Razor, came from. So hope that didn’t increase beyond what’s necessary, the # entities required to explain it!