The Act 1x1 -

A "1x1" often refers to a one-block gap. The "Super Sonic" achievement requires flying through such a gap at high speed using an Elytra.

"The point of view from which the passage is told is best described as that of a...". The Act 1x1

The "1x1" (Pilot) script features the famous prologue in Lawrence, Kansas, where Mary Winchester encounters a supernatural threat in the nursery. A "1x1" often refers to a one-block gap