We have mirrors in our garden for visual challenges and spreading winter light. They also entertain birds, especially wrens, but also blackbirds. Blackbirds are a troublesome introduced species in Australia. They have fine voices but are survivors which compete vigorously for habitat with less assertive native bird species.
Here is a movie of a female blackbird at a mirror. Raising the question of whether the infatuation with the bird in the mirror provide some contraceptive limitation to the spread of blackbirds, at least in our garden.... :-)
(We have at the moment only bowerbird visits, the dancing pavilion area is a bit bare and exposed in the end of winter and with essential pruning.)