Before the age of batteries and electronic sophisticates, there were wind-up toys. Mere mechanical wonders involving hidden spring actions and tightly wound coils for deliberative unwinding to propel movement, they betrayed a sense of wonder for their independence once released by the child’s hand. But the movement stopped; the unwinding of spring actions released to their full extent; and further human involvement was necessary. In stage plays of yore, what amounts to a “deus ex machina” required intervention; and so the thumb and forefinger would grasp the flat key inserted in the back of the toy, […]