I
Order begins with proportion
Every interval is set against a clear ratio before a single note is sounded.
OCTAVE
The Measure of Accord
II
Difference reveals the harmony
The changing sweep of each orbit gives its own voice to the greater chord.
FIFTH
III
Each body keeps its appointed course
A shared center holds the moving figures without making them alike.
THIRD
IV
The whole is proved in the particulars
One measured relation, repeated faithfully, lets the complete figure appear.
SIXTH