He was moving at a brisk pace – too fast for comfort, as if time was slightly accelerated so he could cover as much ground as possible. Yet he was not conscious of any effort; he felt he was a guest in someone else's body. The sensation was enhanced by the fact that he had no control over his movements. When he attempted to stop, or to change direction, nothing happened. He was going along for the ride.

It did not matter; he was enjoying the novel experience – and could appreciate how addictive it could become. The 'dream machines' that many scientists of his own century had anticipated – often with alarm – were now part of everyday life. Poole wondered how Mankind had managed to survive: he had been told that much of it had not. Millions had been brain-burned, and had dropped out of life.

Of course, he would be immune to such temptations! He would use this marvellous tool to learn more about the world of the Fourth Millennium, and to acquire in minutes new skills that would otherwise take years to master. Well – he might, just occasionally, use the Braincap purely for fun...

He had come to the edge of the forest, and was looking out across a wide river. Without hesitation, he walked into it, and felt no alarm as the water rose over his head. It did seem a little strange that he could continue breathing naturally, but he thought it much more remarkable that he could see perfectly in a medium where the unaided human eye could not focus. He could count every scale on the magnificent trout that went swimming past, apparently oblivious to this strange intruder...

Then, a mermaid– Well he had always wanted to meet one, but he had assumed that they were marine creatures. Perhaps they occasionally came upstream – like salmon, to have their babies? She was gone before he could question her, to confirm or deny this revolutionary theory.