The examples Susan provided were from Homer's Iliad, and from the poet Navarre Scott Momaday, two tough acts to follow.
I've chosen Momaday's simile in, I hope, a completely different way.
what can we say to each other now?
now that we’re like two cats in one box
backs arched, tails up,
green eyes flashing,
backing up into our corners
only to move again,
perhaps at air,
perhaps at one another,
finally falling asleep, separately,
only to waken,
both in the center of the box,
in temporary amity
Note: none of these photos are mine, so I have attributed them as I have found them, in the hope I have not contravened any copyright.