The interesting thing about this image is that although it might initially appear to be a patch of sky filled with stars, in fact most of the objects in this image are galaxies, much like in the famous Hubble deep field image. There are over 200,000 galaxies in this image. If you click to zoom the picture, even the tiny red pixels scattered all over the background are not stars, but in fact entire galaxies whose light has been red-shifted.
Click the image for a larger version. If you want a really large version of this image, you can download a 250-MB version from the ESO. The large version is 17,000 x 11,000 pixels.