#2865: The Wrong Stuff
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Transcript
[A ghost is approaching Cueball in a workshop. They are surrounded by shop equipment, such as a table with a press on it, and a small pile of what appears to be lumber. Cueball is backing away from the ghost, holding his hands up defensively.]
Ghost: oooOOOOOOoooo
[The "ooooo"s of the ghost are written in wavy letters of varying sizes]
Ghost: Build a spaceship out of bricks!
Ghost: oooooOOOOOOOOoo
Cueball: No! Go away!
[Caption below the panel:]
The Spruce Goose, the Project Habakkuk Ice Ship, and the Trojan Horse were all work of the Material Phantom, a ghost that wanders the Earth convincing engineers to make giant vehicles out of the wrong stuff.
(Sourced from explainxkcd.com)
Title text:The phantom found Edward Everett Hale a century too early; by the time we invented satellites, the specifics of his 'brick moon' proposal were dismissed as science fiction.