"The Tower Bird" by Jane Yolen from Dragonfield: and Other Stories

 This first appeared in Ariel: The Book of Fantasy, ed. Thomas Durwood; reprinted in 100 Great Fantasy Short Short Stories, ed. Martin H. Greenberg, Terry Carr, and Isaac Asimov.

This little tale tips expectations on their head.  A king begs a bird to give him answers.  The bird only responds in riddles until one day a response out of exasperation changes everything.

The perspective change may alter the way the reader views the universe.