I was inspired to think about the vitreous humor of the eye, where there is a translucent substance compounded from lesser forms in the interior chamber of the eye, and then certain spirits at the right side rather high up, where I recall no one having appeared before, said that they saw a heaven than which there is nothing more beautiful, namely, a pearly, and crystal, and diamond-like realm, as if the whole realm consisted of these brilliances, and the whole aura radiant with them in the tiniest forms like most beautiful rainbows. Then encircling them round about was the form of a very large rainbow, extremely beautiful. Now that same rainbow made up of those tiniest ones, so to speak, or from which the tiniest ones were born as most beautiful images, is the heaven of the rainbow, or rainbow heaven, with which the vitreous humor of the eye interacts. 1748, 20 Sept.