The sky is an immortal tent built by the Sons of Los:
And every space that a man views around his dwelling-place
Standing on his own roof or in his garden on a mount
Of twenty-five cubits in height, such space is his universe:
And on its verge the sun rises and sets, the clouds bow
To meet the flat earth and the sea in such an order’d space:
The starry heavens reach no further, but here bend and set
On all sides, and the two Poles turn on their valves of gold:
And if he moves his dwelling-place, his heavens also move
Where’er he goes, and all his neighbourhood bewail his loss.
Such are the spaces called Earth and such its dimension.
As to that false appearance which appears to the reasoner
As of a globe rolling through voidness, it is a delusion of Ulro.
The microscope knows not of this nor the telescope: they alter
The ratio of the spectator’s organs, but leave objects untouch’d.
For every space larger than a red globule of Man’s blood
Is visionary, and is created by the Hammer of Los;
And every space smaller than a globule of Man’s blood opens
Into Eternity of which this vegetable Earth is but a shadow.
The red globule is the unwearied sun by Los created
To measure time and space to mortal men every morning.

-William Blake

THE EYE is the first circle; the horizon which it forms is the second; and throughout nature this primary picture is repeated without end. It is the highest emblem in the cipher of the world. St. Augustine described the nature of God as a circle whose centre was everywhere and its circumference nowhere. We are all our lifetime reading the copious sense of this first of forms. One moral we have already deduced in considering the circular or compensatory character of every human action. Another analogy we shall now trace, that every action admits of being outdone. Our life is an apprenticeship to the truth that around every circle another can be drawn; that there is no end in nature, but every end is a beginning; that there is always another dawn risen on mid-noon, and under every deep a lower deep opens.  1   This fact, as far as it symbolizes the moral fact of the Unattainable, the flying Perfect, around which the hands of man can never meet, at once the inspirer and the condemner of every success, may conveniently serve us to connect many illustrations of human power in every department.  2  There are no fixtures in nature. The universe is fluid and volatile. Permanence is but a word of degrees. Our globe seen by God is a transparent law, not a mass of facts. The law dissolves the fact and holds it fluid.

-Ralph Waldo Emerson

You have noticed that everything an Indian does is in a circle, and that is because the Power of the World always works in circles, an everything tries to be round….The sky is round, and I have heard that the earth is round like a ball, and so are all the stars. The wind, in its greatest power, whirls. Birds make their nests in circles for theirs is the same religion as ours….Even the seasons for a great circle back again to where they were. The life of a man is a circle from childhood to childhood, and so it is in everything where power moves.
-Black Elk (1863-1950) Ogalala, Sioux holy Man