The Time Traveller looked at us, and then at the mechanism. “Well?” said the Psychologist.

“This little affair,” said the Time Traveller, resting his elbows upon the table and pressing his hands together above the apparatus, “is only a model. It is my plan for a machine to travel through time. You will notice that it looks singularly askew, and that there is an odd twinkling appearance about this bar, as though it was in some way unreal.” He pointed to the part with his finger. “Also, here is one little white lever, and here is another.”

The Medical Man got up out of his chair and peered into the thing. “It’s beautifully made,” he said.