Yeah, we know, decorative paperweight is normally a pejorative term for something that serves no other purpose than to sit there and look pretty so we'll let Tycho--who knows his way around a word or two--describe it himself:
"It's three dimensional, tiny bubbles like "voxels" (remember those?) describe the entire image. These objects (along with their black case/purple velvet interior) were given to the developers when they completed First Hunt for the DS launch. So owning it makes me feel a little like a fraud, but then I gaze into its tranquil depths and the world (with all its troubles) disappears."
[Thanks, Mack Swift]