Jo,
looking at this, it could have been all too easy to make it a symetrical object. The differences in the size of the two discs and the 'clipped off' base to the left of the image greatly enhance the overall effect.
To link to another thread, having followed your designs from the single disc, groups of single discs, the three discs and now this, all fit's into our discussion on design.
You posting is very opertune,
Thank you.