The imagery of your falcon within the gyre isn’t much removed from the imagery of a pern in the gyre. Could Yeats have misspelled pern (spelling it perne)? If just one thinks of Yeats’s perne to be a chook of prey, then Yeats’ is evaluating the sages to birds of https://gr-din68900.isblog.net/perne-ergonomice-secrets-39154059