Classic Poem

How is it the floating island
detaches itself from horizon in dream -
its first appearance, otherworldly,
but of this world, a wheel loosened
from the world's ratchet, out of time,
riding above it and inhabited by
folk fixated upon a particular
theorem-thought; elevated imponderables,
whereby you access this island by door
set underneath as you sail under?
Islands, a dream of round towers!
the sudden rush of water under hulls.