EXPANSION-CONTRACTION
(Faster the speed - smaller the circle).

When equilateral triangles are drawn (sides equalling the vertical segment in the circle), and a series of circles divided by half the previous circle are constructed the natural limits of this progression ends at the fifth circle. If time values are given to these circles, as well as tone value, the time value becomes a whole tone for the first circle, succeeded by 2, 4, 8, z, ¦,... a reasonable limit.