'I used to watch them as a kid. My granny told me about 'em. Some cold nights you see them dancin' in the sky over the Hub, burnin' green and gold. . .'
'Oh, you mean the aurora coriolis,' said Oats, trying to make his voice sound matter of fact. 'But actually that's caused by magic particles hitting the-'
'Dunno what it's caused by,' said Granny sharply, 'but what it is is the phoenix dancin'.'
Thankyou, Pterry, for this infinitely useful catchphrase for anything that, in being overanalysed and deconstructed in order to explain this, that and the other, remains itself.