“This is one way to account for the Blind Spot.  It may be merely another phase of the spectrum—­not simply the unexplored regions of the infra-red or the ultra-violet, but a region co-existent with what we normally apprehend, and making itself manifest through apertures in what we, with our extremely limited sense-grasp, think to be a continuous spectrum.  I throw out the idea mainly as a suggestion.  It is not necessarily the true explanation.

“Let us go a bit farther.  Remember, we are still upon the earth.  And that we are still in San Francisco, although all the while we are also in the Mahovisal.  This is 288 Chatterton Place, and at the same time it is the Temple of the Bell.  It might be a hundred or a thousand other places just as well, too, if my hypothesis is correct; which we shall see.

“Now, what does this mean?  Simply this, gentlemen, that we five-sensed people have failed to grasp the true meaning of the word ‘Infinity.’  We look out toward the stars, fancying that only in unlimited space can we find the infinite.  We little suspect we ourselves are infinity!  It is only our five senses that make us finite.

“As soon as we grasp this the so-called spiritual realm becomes a very substantial fact.  We begin to apprehend the occult.  Our five-sensed world is merely a highly specialized phase of infinity.  Material or spiritual—­it is all the same.  That’s why we look on the Thomahlians as occult, and why they consider us in the same light.

“It is strictly a question of sense perception and limitations, which can be covered by the word, ‘viewpoint.’  Viewpoint—­that is all it amounts to.

“There is no such thing as unreality; but there is most certainly such a thing as relativity, and all life is real.

“Of course I knew nothing of this until the discovery of the Blind Spot.  It will, I think, prove to be one of the greatest events in history.  It will silence the sceptics, and form a bulwark for all religion.  And it will make us all appreciate our Creator the more.”

The professor stopped.  For some moments there was silence.

“What are we to do now?” asked Harry.

But the professor chose not to answer.  With his tape he began taking a fresh series of measurements, with reference to the empty sockets and one particularly brilliant red gem, which seemed to be “number one” in the circle.  From time to time the doctor jotted down the results and made short calculations.  Presently he said:  “That ought to be enough.  Now suppose we—­”

At that instant something happened.  Harry Wendel caught him by the shoulder.  He pointed to the suspended stone.

It was moving!

It was revolving, almost imperceptibly, like some vast wheel turning on its axis.  So slowly did it rotate, the motion would have escaped attention were it not for the gems and their brilliance.

Suddenly it came to a stop, short and quick, as though it had dropped into a notch.  And from above they heard the deep, solemn clang of the temple bell.