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PSYCHISM AND THE FOURTH DIMENSION
and the direction of the beam could only have been conceived by a three-dimensional being as going in all directions at once.
To sum up no three-dimensional light could have behaved as this light did behave; and a four-demensional light would have behaved exactly as this light behaved; the conclusion obviously is, that the light observed by Zollner was a four-dimensional light.
To return to a point we touched on a moment ago. We dealt with a perpendicular to a line, and with a perpendicular to a plane by carrying this idea on, it will be evident that, in four-dimensional space, a perpendicular may be drawn to a solid, and the beam in Zollner's experiment was actually perpendicular to the cubical, or approximately cubical, room in which the experiment took place.
To go back a little all the sensory organs of the body, the retina, tympanum, palate, or skin, are surfaces, that is, two-dimensional: but objects appear to us three-dimensional : further, our mental conceptions are four-dimensional. Let us illustrate this: we cannot see inside a closed opaque box, a four-dimensional being could not only see inside such a box, but could write a message inside. But let us now form a mental image of such a box. Though it appears to our minds opaque, yet we can with the mind's eye see both the inside and the outside at once; hence-and this is of the first importance-our mental conceptions are fourdimensional. Hence the mind can conceive four-dimensional perpendicular to three-dimensional
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