This is the reason of an appearance very frequent in madmen; that they remain whole days and nights, sometimes whole years, in the constant repetition of some remark, some complaint, or song; which having struck powerfully on their disordered imagination, in the beginning of their frenzy, every repetition reinforces it with new strength, and the hurry of their spirits, unrestrained by the curb of reason, continues it to the end of their lives.
SECTION IX.
SUCCESSION AND UNIFORMITY.
Succession and _uniformity_ of parts are what constitute the artificial infinite.1.

_Succession_; which is requisite that the parts may be continued so long and in such a direction, as by their frequent impulses on the sense to impress the imagination with an idea of their progress beyond their actual limits.2.

_Uniformity_; because, if the figures of the parts should be changed, the imagination at every change finds a check; you are presented at every alteration with the termination of one idea, and the beginning of another; by which means it becomes impossible to continue that uninterrupted progression, which alone can stamp on bounded objects the character of infinity.

It is in this kind of artificial infinity, I believe, we ought to look for the cause why a rotund has such a noble effect.[20] For in a rotund, whether it be a building or a plantation, you can nowhere fix a boundary; turn which way you will, the same object still seems to continue, and the imagination has no rest.

But the parts must be uniform, as well as circularly disposed, to give this figure its full force; because any difference, whether it be in the disposition, or in the figure, or even in the color of the parts, is highly prejudicial to the idea of infinity, which every change must check and interrupt, at every alteration commencing a new series.