In Xanadu

And from this chasm, with ceaseless turmoil seething,

As if this earth in fast thick pants were breathing,

A mighty fountain momently was forced;

Amid whose swift half-intermitted burst

Huge fragments vaulted like rebounding hail,

Or chaffy grain beneath the thresher's flail:

And 'mid these dancing rocks at once and ever

It flung up momently the sacred river.

-Coleridge, "Kubla Khan"