This diagram is a visual representation of four beats, first shown whole, then divided into two parts, three, and so on up to eight. The v-shaped lines represent the groupings of these subdivisions into groups of two and three. The groups of two are above, and three below. The number of possible pathways along these lines, moving across the four beats on either the upper or lower pathways, represents every possible permutation of subdivisions grouped into twos and threes (total pathways = 4,928)
A book, listing these patterns in standard notation
