it presents all the sections of the site at once, kind of like a compact sitemap. because of this, every section is directly accessible from every other section (i.e., the two organizational axes are presented orthogonally).
plus i just think the legos look cool :-)
for those wondering, this was all done on the computer, no photography involved... thanks to Mac Brick CAD (a lego construction program which exports pov-ray files), POV-ray (a renderer), and Photoshop Elements (this makes redoing it a snap, just re-CAD and re-render to try something new).
comments, questions? good/bad color choices? please drop some feedback.