In this speculative, millennial essay, I try to anticipate what sort of nov
el gravitational optics investigations might be undertaken after it becomes
possible to map and monitor roughly 10(12) sources (of which 10(9) may be
usefully variable) comprehensively throughout electromagnetic and other spe
ctra over the whole sky. Existing techniques suffice to produce three-dimen
sional maps of the dark matter distribution of the accessible universe, to
explore black hole spacetimes, and to magnify images of the first luminous
sources, terrestrial planets, and compact objects.