"The question," observed Burke, "isn't whether it makes sense, but whether it's fact. According to the last word from Earth, they're still insisting that the ship's drive is against all reason. But we're here. And speaking of reason, would the average person look at this place and say blandly, 'Ah, yes! A fortress in space. To be sure!' Would they? Is this place reasonable?" Holmes grinned. "I'll go along with you there," he agreed. "It isn't. But you say its garrison was men. Look here! Have you seen a place before where men lived without writings in its public places? They tell me the ancient Egyptians wrote their names on the Sphinx and the Pyramids. Nowadays they're scrawled in phone booths and on benches. It's the instinct of men to autograph their surroundings. But there's not a line of written matter in this place! That's not like men!" "Again," said Burke, "the question isn't of normality, but of fact." "Then I'll try it," said Holmes skeptically. "How does it work?" "I don't know. But put a cube about a yard from your head, and doze off. I think you'll have an odd dream. I did. I think the information you'll get in your dream will check with what you find around you. Some of it you won't have known before, but you'll find it's true." "This," said Holmes, "I will have to see. Which cube do I try it with, or do I use all of them?" "There's apparently no way to tell what any of them contains," said Burke. "I went back to the storeroom and brought a dozen of them. Take any one and put the others some distance away--maybe outside the ship. I'm going to talk to Keller. He'll make a lot of use of this discovery." Holmes picked up a cube. "I'll try it," he said cheerfully. "I go to sleep, perchance to dream. Right! See you later." Burke moved toward the ship's air-lock. "Pam and I have some housekeeping to do," Sandy said. Burke nodded abstractedly. He left the ship and headed along the mile-long corridor with the turn at the end, a second level and another turn, and then the flight of steps to the instrument-room. As he walked, the sound of his footsteps echoed and reëchoed. Behind him, Holmes set a cube in a suitable position and curled up on one of the side-wall bunks in the upper compartment of the spaceship. "We'll go downstairs," said Sandy. Pam parted her lips to speak, and did not. They disappeared down the stair to the lower room. Then Sandy came back and picked up the extra cubes. "Joe said to move them," she explained.