Narrator: It is well known that all manner of ghosts may travel freely through the walls of built-up structures.

Narrator: However, underground homes must be entered via doors or windows.

Narrator: Skyscrapers, which sway in the wind, are deeply confusing to nightmares and hags trying to crouch on a sleeper's body.

Narrator: Ghosts must travel carefully around the growth in forests but can move freely through an espalier.

Narrator: Contrary to popular superstition, aleatoric (untended) gardens do not keep out ghosts.

Narrator: There have been no ghost sightings on any terraformed planet.