"In a modest villa on the outskirts of Bristol lives Dr Grey Walter, a neurologist, who makes robots as a hobby. They are small, and he doesn’t dress them up to look like men – he calls them tortoises. And so cunningly have their insides been designed that they respond to the stimuli of light and touch in a completely life-like manner. This model is named Elsie, and she sees out of a photo-electric cell which rotates about her body. When light strikes the cell, driving and steering mechanisms send her hurrying towards it. If she brushes against any objects in her path, contacts are operated which turn the steering away, and so automatically she takes avoiding action. Mrs Walter’s pet is Elmer, Elsie’s brother, in the darker vest. He works in exactly the same way. Dr Walter says that his electronic toys work exactly as though they have a simple two-cell nervous system, and that, with more cells, they would be able to do many more tricks. Already Elsie has one up on Elmer: when her batteries begin to fail, she automatically runs home to her kennel for charging up, and in consequence can lead a much gayer life."