Visible Invisible

"The great aspiration of the Human Race is to gain a knowledge of the Reality, the Noumenon behind the phenomenon; but the fact that from infancy we have been accustomed to confine our attention wholly to the objective, believing that to be the reality, has surrounded us with a concrete boundary wall through which we can only at times, with difficulty, get transient glimpses of that which is beyond. It is only in recent years that we have been able to realize that it is the Invisible which is the Real, that the visible is only its shadow or its manifestation in the Physical Universe, and that Time and Space have no existence apart from our physical senses, in short, that they are only the modes or limits under which those senses act or receive their impressions and by which they are necessarily rendered finite.

The difficulty is that our physical senses only perceive the surface of our surroundings, and that we have hitherto been looking at the Woof of Nature as though it were the glass of a window covered with patterns, smudges, flies, &c., comprising all that we call physical phenomena and which, when analyzed in terms of Time and Space, produce the appearance of succession and motion. It requires a keener perception, unbounded by these limitations, to look through the glass at the Reality which is beyond.

...

Although we have no words to express, nor indeed minds to grasp, the wonders and glories of that which is behind the Veil, it is possible for some of us to get a glimpse of it through our Window. [...] We have seen that it is the Invisible which is the Real, that the visible is only its shadow; that the Invisible, as distinguished from the Visible, is not in a place apart from the Physical, but is the Reality of which the visible constitutes the boundary lines or planes in our consciousness."

- Sydney Turner Klein (1853 - 1934)
Science and the Infinite