Hmm, interesting, but what's the use of this?

Ooo, pretty picture... I think a little more detail would be nice.

Clicking the picture shows an enlarged view. This shows the code for the main page of this site.

This displays meta-data held about the shown image - including associated categories - which I presume is also used in an image library feature as well. Note the export as xml - this carries the image also - vey nice.

So the purpose of this acreen is to help you manage (and re-use) your images.