22 April 2009
The inner circle is the vowels, middle is the consonants (including kṣa) and the outer circle is the famous phrase: ye dharmā hetuprabhava hetuṃ teṣaṃ tathāgataḥ hyavadat, teṣaṃ ca yo nirodha - evaṃ vādī mahāśramaṇaḥ. The latter is often included in the visualisation practices. All start at 12 o'clock.
I think however that the vowels and consonants should be going in different directions - so this is just to give you an idea and is not definitive. I plan to do a definitive version in Siddhaṃ at some point.