The Opal Dream Cave

In an opal dream cave I found a fairy:
Her wings were frailer than flower petals,
Frailer far than snowflakes.
She was not frightened, but poised on my finger,
Then delicately walked into my hand.
I shut the two palms of my hands together
And held her prisoner.
I carried her out of the opal cave,
Then opened my hands.
First she became thistledown,
Then a mote in a sunbeam,
Then--nothing at all.
Empty now is my opal dream cave.