Swallowtail

Chuang Tzu in dream became a butterfly,
And the butterfly became Chuang Tzu at waking.
Which was the real -- the butterfly or the man?
Who can tell the end of the endless changes of things?

from Chuang Tzu and the Butterfly, by Li Po

And yet, despite this philosophical conundrum, I felt pretty certain my work day had indeed ended when I got home and saw this visitor fluttering around the lilac bush outside the front door.