“Oak… lasts for an unlimited period when buried in underground structures.”
...when exposed to moisture... it cannot take in liquid on account of its compactness, but, withdrawing from the moisture, it resists it and warps, thus making cracks.
Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book II, Chapter IX, Sec. 8
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Vitruvius 203
Roman writer, architect and engineer -80–-15 BCRelated quotes

The Man With the Blue Guitar (1937)
Context: Do not speak to us of the greatness of poetry,
Of the torches wisping in the underground,
Of the structure of vaults upon a point of light.
There are no shadows in our sun,
Day is desire and night is sleep.
There are no shadows anywhere.
The earth, for us, is flat and bare.
There are no shadows.

Opium (1929)
The brave old Oak (lyrics, 1837).

“The oak fought the wind and was broken, the willow bent when it must and survived.”
Source: The Fires of Heaven

“Education, the last hope of the liberal in all periods.”
To the Finland Station (1940) [Farrar Straus & Giroux, 1972, ISBN 1568495749/1145], Part I, Ch. 5: Michelet Between Nationalism and Socialism, p. 36

“When your dreams tire, they go underground and out of kindness that's where they stay.”
Libby Houston, in the poem "Gold" in Necessity (1988).
Misattributed