Talk about gradation! After grouting, I was transfixed by the way this piece looks as it spins (FYI: it isn't made to spin, but it was on a lazy susan when I grouted it, so I took advantage of the situation and video'd it).
Originally I had a Beats Antique song as the soundtrack, but had to substitute a royalty free tune to publish. Oh well. :-/
Also, there is a list of links that take you to many of the materials I used to make this piece.