question:  What is the symbolism of the title?
context: Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. [p 135 ] By CHARLES V. DE VET monkey on his back Under the cloud of cast-off identities lay the shape of another man— was it himself? Illustrated by DILLON HE was walking endlessly down a long, glass-walled corridor. The truth lurked in some corner of his consciousness, but it was not reached by surface awareness. The corridor opened at last into a large high-domed room, much like a railway station or an air terminal. At the sight of him a man leaning negligently against a stone pillar, to his right but within vision, straightened and barked an order to him, “Halt!” At the first turn he saw that the aisle merely circled the stairway, coming out into the depot again on the other side. He slipped a coin into a pay slot, opened the zipper on his bag and pulled out a flat briefcase. It took him only a few seconds to push the case into the compartment, lock it and slide the key along the floor beneath the locker. But the fact that they had been expecting him meant that others would very probably be waiting outside. The office window was open, but it let in no freshness, only the mildly rank odor that pervaded all the planet’s habitable area. The floor beneath Zarwell’s feet assumed abruptly the near transfluent consistency of a damp sponge. It rose in a foot-high wave and rolled gently toward the far wall. The floor continued its transmutation, and Zarwell sank deep into viscous depths. He should know all about the instrument, its purpose and workings, but he could not bring his thoughts into rational focus. The feeling was there again, like a scene waiting only to be gazed at directly to be perceived. He moved in and joined a party of short, bearded men, directing them as they battered at the wall with a huge log mounted on a many-wheeled truck.
output:  The monkey represents Zarwell's pattern of joining resistance movements, only to watch them turn corrupt
options:  The monkey represents the series of false memories implanted in Zarwell's mind  The monkey represents Zarwell's affliction with ennui after becoming a civilian and living a more mundane existence  The monkey represents Dr. Bergstrom's manipulative influence on Zarwell's psyche  The monkey represents Zarwell's pattern of joining resistance movements, only to watch them turn corrupt