Trilogy and "The Apu Trilogy" of films by Satyajit Ray. Others are connected only by theme: for example, each film of Krzysztof Kieślowski's "Three Colors" trilogy explores one of the political ideals of the French Republic (liberty, equality, fraternity). Trilogies can also be connected in less obvious ways, such as "The Nova Trilogy" of novels by William S. Burroughs, each written using cut-up technique. The term is less often applied to music, such as the "Berlin Trilogy" of David Bowie which is linked together by musical sound and lyrical themes, all having been recorded at least partly in Berlin, Germany. The
The Illuminatus! Trilogy the "what has gone before" introduction to "The Golden Apple" and the "Prologue" to "Leviathan". Some of the material in that foreword, such as the self-destruct mynah birds (taught to say "Here, kitty-kitty-kitty!"), appears nowhere else in the trilogy, likely a result of the 500 pages of cuts demanded by Dell. The omnibus edition gave a new lease of life to flagging sales, and became the most commonly available form of the trilogy from then on. The trilogy was translated and published in German, again both as separate volumes (the three covers of which formed a triptych) and an omnibus.