For I’ve heard of the theory of directing one’s dreams, but I haven’t met anyone who does, from Dreamtigers.
from Dreamtigers / by Jorge Luis Borges, translated by Mildred Boyer and Harold Morland
The tiger indeed appears, but stuffed or flimsy, or with impure variations of shape, or of an implausible size, or all too fleeting, or with a touch of the dog or the bird.