Advances in engineering created new possibilities for robotic art. In 1893, Prof. George Moore created "The Steam Man", a humanoid mechanism powered by a boiler, which he exhibited in New York City. Supported by a horizontal bar attached to a vertical post, it was capable of walking in a circle at a speed of four or five miles an hour; reportedly, it could not be held back by two men. In 1898, the physicist and engineer Nikola Tesla demonstrated a remote-controlled boat in Madison Square Garden, making use of a specially built indoor pond. This device has been identified as the world's first radio-controlled vessel. Tesla described it as having "a borrowed mind", and envisioned a fleet of fifty or a hundred submarines, or any other kind of vehicle, under the command of one or several operators.