The document is a short story by Julio Cortázar about a man who becomes obsessed with observing axolotls in an aquarium. He spends hours each day watching their barely perceptible movements and is transfixed by their gold eyes. Over time, he starts to feel a strange connection with the axolotls, until one day he looks in the tank and sees his own face staring back at him as an axolotl. He realizes he has transformed into one of the creatures he was observing.