
From the NASA page: ‘even though this illustration has appeared in numerous places over the past 100 years, the actual artist remains unknown. Furthermore, the work has no accepted name…The illustration, first appearing in a book by Camille Flammarion in 1888, is used frequently to show that humanity’s present concepts are susceptible to being supplanted by greater truths.’
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‘Let us then apprehend in our thought this visible universe, with each of its parts remaining what it is without confusion, gathering all of them together into one as far as we can, so that when any one part appears first, for instance the outside heavenly sphere, the imagination of the sun and, with it, the other heavenly bodies follows immediately, and the earth and sea and all the living creatures are seen, as they could in fact all be seen inside a transparent sphere. Let there be, then, in the soul a shining imagination of a sphere, having everything within it, either moving or standing still, or some things moving and others standing still. Keep this, and apprehend in your mind another, taking away the mass: take away also the places, and the mental picture of matter in yourself, and do not try to apprehend another sphere smaller in mass than the original one, but calling on the god who made that of which you have the mental picture, pray him to come. And may he come, bringing his own universe with him, with all the gods within him, he who is one and all, and each god is all the gods coming together into one; they are different in their powers, but by that one manifold power they are all one; or rather, the one god is all; for he does not fail if all become what he is; they are all together and each one again apart in a position without separation, possessing no perceptible shape – for if they did, one would be in one place and one in another, and each would no longer be all in himself…nor is each whole like a power cut up which is as large as the measure of its parts. But this, the [intelligible] All, is universal power, extending to infinity and powerful to infinity; and that god is so great that his parts have become infinite…’
Plotinus, Enneads, V.8.9