"While the work is exceedingly limited in its acoustic range, if you give yourself over to the sense of instability created by the constant variance of the intervals between the two sounds, time seems to elapse in a blink of an eye. As a whole, rather than its acoustic qualities, the series demands that you listen closely to the expansion and contraction and interrelationship of time that is created in the spaces between the sounds." (quoted from: liner notes by Haruyuki Suzuki)