 This reflects the distinction that Bruegel creates between foreground (time passing) and background (time permanent).The first type of documentation of this composition can be found in a sketchbook titled "Modual Book, The Triumph of Time", dated 2 April, 1970, where the composer included several ideas that were related to "An Imaginary Landscape", "Prologue" and a preliminary abandoned version of "The Triumph of Time", all composed between 1970 and 1971.Unlike most pieces that are contemporary to the "Triumph", this is a fine example (and one of the few ones) of program music in the 70s.