And from this chasm, with ceaseless turmoil seething, as if this earth in fast thick pants were breathing, a mighty fountain momently was forced: 20 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. ("kubla khan," lines 17-24) the rhythm in the excerpted lines of coleridge's poem can be compared to .