This is actually a portrait of emptiness, even though it glitters with galaxies. The bright elliptical galaxy in the top center, ESO 306-17, has absorbed every galaxy around it and grown to monstrous proportions.

Over at Bad Astronomy, Phil Plait explains:

ESO 306-17 sits about a billion light years from Earth. In this picture it looks like it's surrounded by other galaxies, but that's an illusion: all the other galaxies you see here are either much closer to us or much farther away . . . Michael West, who led the team that took these images, tells me the little elliptical at the bottom left of ESO 306-17 may be interacting with it. It's difficult to tell; but what is certain is that there are very few galaxies near the big one, far fewer than you'd expect.

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Plait adds that this lonely galaxy shares certain properties with our own cannibalistic galaxy, the Milky Way. Both our galaxy and ESO 306-17 are surrounded by globular clusters left over from galaxies they consumed.

You can contemplate the universe in higher resolution with this gigantic version of the image.