If you're familiar with Mahayana Buddhism, you've probably encountered the teaching of Indra's Net, an infinitely vast, three-dimensional net with jewels at the nodes. Each jewel contains infinite worlds and, at the same time, perfectly reflects every other jewel in the infinite net. While some folks interpret Indra's Net as an illustration of emptiness, dependent origination, and interdependence, my preference is to sit quietly and allow the imagery to illuminate the universe beyond thought.
The Brahma Net Sutra begins with a similar image, that of Brahma's Net, a "wonderful Jewel Net hung in Lord Brahma's palace," in which "the innumerable worlds in the cosmos are like the eyes of the net. Each and every world is different, its variety infinite."
Interestingly, Vairocana Buddha (not Shakyamuni Buddha) gives the teaching of the sutra. After some preliminaries, Vairocana Buddha offers another example of a net, this one containing countless Shakyamuni Buddhas: