A Question

From the OED entry on “ignis fatuus”: “It seems to have been formerly a common phenomenon; but is now exceedingly rare.

Why?

Because it was what it was thought to be, and has sensibly sublimated to a different medium? Did McLuhan write anything about this? I’m pretty sure he must have.

I’m also coming round to the idea that Gregor’s sister Grete was čarodějnice. Cui bono, etc.