Tesla's Machine The Prestige
The machine introduces science fiction into a stage-magic thriller and divides the audience
Tesla's duplication device is the most controversial element of The Prestige. For the first 80 minutes, the film operates within the logic of Victorian stage magic -- doubles, trapdoors, misdirection, sleight of hand. Then Angier arrives in Colorado Springs and discovers a machine that duplicates matter. The rules of the film's world change irreversibly.
The machine does not teleport. It copies. The original remains where it stands; a perfect duplicate appears at a distance. Tesla's "failed" experiments -- which appeared to produce no result -- were working every time. The field of identical top hats on the Colorado hillside, shown in the film's opening image, is the residue of successful duplications.
The machine splits the film's critical reception along a specific fault line
Roger Ebert gave the film three stars and identified the Tesla machine as a "fundamental flaw" -- the film establishes rules of Victorian-era stage magic and then introduces a device that renders those rules irrelevant. Emanuel Levy framed the same issue more diplomatically: the film's success depends on the viewer's "willingness to suspend disbelief." (wikipedia)
Other critics saw the escalation as deliberate and earned. The machine arrives at the film's structural midpoint, exactly where the Yorke five-act model places the crisis that overturns the protagonist's understanding of the world. Before the machine, both magicians operate in the same arena. After the machine, Angier has access to something Borden cannot match -- and the rivalry shifts from professional competition to existential horror.
Tesla warns Angier to destroy it, and Angier ignores the warning
Tesla's farewell letter is the film's clearest moral statement. He has seen obsession destroy his own career -- Edison's campaign drove him from New York to Colorado Springs -- and he recognizes the same pattern in Angier.
Tesla delivers two warnings. The first is philosophical: "I can recognize an obsession. No good will come of it." The second is practical: "I beg you to take what I have built and destroy it." Angier ignores both. Tesla burns his laboratory and flees Edison's agents, leaving the machine packed in a crate.
The machine makes Angier's trick work by making murder the mechanism
Angier's "Real Transported Man" uses the machine to duplicate himself during each performance. The duplicate appears in the balcony -- the prestige. The original falls through a trapdoor into a locked water tank and drowns. A blind stagehand operates the mechanism. The padlock is real.
The nightly duplication means Angier performs the trick as a suicidal ritual. Each night he steps into the machine not knowing whether he will be the man who appears in the balcony or the man who drowns in the tank. The film does not resolve the question of whether the drowning man is the "original" or the "copy" -- the duplication is perfect, and the distinction may be meaningless.
The closing image answers the opening image
The film opens on a field of identical top hats scattered across a Colorado hillside -- an image whose significance is not explained until the machine is revealed. The film closes on rows of water tanks in Angier's theater basement, each containing one of his drowned duplicates. Both images are residue of the same machine: hats from the experiments, bodies from the performances. The opening was the mystery; the closing is the cost.
The novel's machine works differently
In Christopher Priest's novel, Tesla's device produces copies that are materially degraded -- what Priest calls "prestiges." The film's machine creates perfect duplicates, which raises different philosophical questions. Priest's version asks what is lost in copying; Nolan's version asks whether the original and the copy are meaningfully different at all. (wikipedia)