brown, blue, brown on blue" is significant within günter's oeuvre as an intuitive leap from his previous works. This is tobe appreciated; many of his pieces consist of events linked by intuitive leaps across silence -- e.g., a sequence of sounds may strike the listener as a riddle or conundrum. Riddles and conundra abound from event to event within his works, but not between works. His pieces are rarely at odds with each other. "brown, blue, brown on blue" goes some distance to change that.
A quick revision to the first metaphor -- günter's music would most closely resemble a tree had you never seen a tree. [David Grubbs, SÜDDEUTSCHE ZEITUNG, 2000]