The Apsara reference article from the English Wikipedia on 24-Apr-2004
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Apsara

Time you got around to sponsoring a child
In Hinduism, the Apsaras are nature spirits, all the female wives of the Gandharvas. They danced to the music made by their husbands, usually in the various gods' palaces.

Alternative: Vrikshakas, Vrikshaka

Apsara relief
Apsara relief, from Angkor Wat, Cambodia