Setting: a lone house stands on a Scottish moor. The fog is dense here. It is difficult to estimate where your foot will fall. A figure in a cloak stands in front of the door.

Figure: [rapping on the door, in a Highland accent] Knock knock!

Voice from inside: Who’s there?

Figure: Glivenko!

Voice: Glivenko who?

Figure: Glivenko-Cantelli!

[The fog along the moor converges uniformly on the house, enveloping it completely in a cumulus.]

Scene.