Monadnock Through the Trees
Egyptian pyramid construction
The 'prodigious means / For the self-heavy sleep' refers to pyramids—tombs so massive they literally weigh down the dead. Robinson's periphrasis emphasizes their absurd scale.
Unvisioned here
Monadnock existed before humans conceived of it or named it. The mountain predates human consciousness itself.
If we know how
The conditional is crucial—Robinson doubts humanity's capacity for genuine self-awareness even at the end of history.
Assyrians went howling
The Assyrian Empire (circa 2500-609 BCE) was known for brutal military campaigns. 'Howling' suggests both war cries and animalistic violence.