Time, Real and Imaginary

Lyrics

On the wide level of a mountain's head, (I knew not where, but 'twas some faery place) Their pinions, ostrich-like, for sails out-spread, Two lovely children run an endless race,                 A sister and a brother!                 This far outstripp'd the other; Yet ever runs she with reverted face. And looks and listens for the boy behind:                 For he, alas! is blind! O'er rough and smooth with even step he passed, And knows not whether he be first or last.