"Of our universe, then, we now have Matter, Time and Space. There is a fourth--shall I say, element? It also is interdependent with each of the other three. It is _Motion_. You know, of course, that there can be no such thing as absolute Motion." "Or absolute Time," Frannie put in. "That we will discuss later," Dr. Gryce said quickly, "since it is more intricate of conception. Absolute Motion is impossible and non-existent. We can say a thing moves fast or slowly, _only in relation to the movement of something else_. One word more. I want you to realize, Frank, how wholly dependent each of these factors is upon the other. _Matter_, for instance, is an entity persisting in Space and Time. _Motion_ is the simultaneous change of the position of Matter in Space and Time. A thing was _here, then_; it is _there, now_. That is Motion. You see how you can not deal with one without involving the others?" "Say, Father, why don't you tell him what we're going to do?" Martt demanded. "Frank, listen--tonight Brett and I----" "But I'm going, too," Frannie declared. "You're not!" I saw again that look of fear in old Dr. Gryce's eyes. His children--the spirit of youth with its lust for adventure--they were eager and excited. But Dr. Gryce saw beyond that--saw the danger. . . He said gravely, "There is no possibility of my making you understand the details, Frank, until we have gone into the matter thoroughly. But as Martt implies, you are no doubt impatient. I will tell you then, briefly, that for most of my life I have been delving into this subject--Matter, Space, Time and Motion illimitable. Longing to investigate this immense material universe which I believe exists. But we humans are fettered, Frank. Like an ant, living for a brief moment enchained with a cobweb to a twig and trying to envisage the earth." His voice now was trembling with emotion. "I was satisfied to see with my own eyes some little part into infinity. I invented what we--my children and I--call the myrdoscope. I will explain it presently. Suffice it now to say that there are normally invisible rays, akin to light, crossing Space, and I have made them visible. We captured them--saw after a myriad trials unavailing, occasional vague glimpses of the beyond which came to us. It might have satisfied me, but three years ago, one night, Brett saw----" He paused, looking at Brett. Martt and Frannie were breathless, with eyes fixed on me. Brett said, and his voice had a queer, solemn hush to it, "I was looking through the myrdoscope. We had seen blurred, brief glimpses of a realm----" "Beyond the stars," Frannie breathed. "Yes, beyond the stars. A realm seemingly of forest, or something growing. Silvery patches--you might imagine they were water, or light shining upon something that glistened. They were always haphazard, these glimpses. We caught them, not always from one direction--seemingly from everywhere. A realm encompassing--enclosing--our whole star-filled Space.