What is "makrokosmos"

Makrokosmos is a series of four volumes of pieces for piano by American composer George Crumb. The name alludes to Mikrokosmos, a set of piano pieces by Béla Bartók, one of Crumb's favorite 20th-century composers. The first volume of the set was composed in 1972, while the last was completed in early 1979; the first performance of all four volumes in sequence was given by Yvar Mikhashoff, Aki Takahashi, Stephen Manes, Freida Manes, Jan Williams and Lynn Harbold, in Buffalo, New York, on 12 June 1980.