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Appearance and voice recordings

Unlike the image of the classic magician, Houdini was short and stocky and typically appeared on stage in a long frock coat and tie. Most biographers give his height as 5 feet 5 inches (1.65 m), but descriptions vary. Houdini was also said to be slightly bow-legged, which aided in his ability to gain slack during his rope escapes. In the 1997 biography Houdini!!!: The Career of Ehrich Weiss, author Kenneth Silverman summarizes how reporters described Houdini's appearance during his early career:

They stressed his smallness – "somewhat undersized" – and angular, vivid features: "He is smooth-shaven with a keen, sharp-chinned, sharp-cheekboned face, bright blue eyes and thick, curly, black hair." Some sensed how much his complexly expressive smile was the outlet of his charismatic stage presence. It communicated to audiences at once warm amiability, pleasure in performing, and, more subtly, imperious self-assurance. Several reporters tried to capture the charming effect, describing him as "happy-looking", "pleasant-faced", "good natured at all times", "the young Hungarian magician with the pleasant smile and easy confidence".

Houdini made the only known recordings of his voice on Edison wax cylinders on October 29, 1914, in Flatbush, New York. On them, Houdini practices several different introductory speeches for his famous Chinese Water Torture Cell. He also invites his sister, Gladys, to recite a poem. Houdini then recites the same poem in German. The six wax cylinders were discovered in the collection of magician John Mulholland after his death in 1970. They are part of the David Copperfield collection.