"There is, however, one feature that I would like to suggest should be incorporated in the machines, and that is a 'random element.' Each machine should be supplied with a tape bearing a random series of figures, e.g., 0 and 1 in equal quantities, and this series of figures should be used in the choices made by the machine. This would result in the behaviour of the machine not being by any means completely determined by the experiences to which it was subjected, and would have some valuable uses when one was experimenting with it."

Source: B. E. Carpenter, Alan Mathison Turing, Michael Woodger (1986). “A.M. Turing's ACE report of 1946 and other papers”, The MIT Press