This "Fuga colorata" attributed to Giovanni Gabrieli (~1555 - 1612) is not a fugue in the modern sence of the word. Though it starts with a fugal like exposition, the theme of that first episode does not reutn in the rest of the composition. This "Fuga colorata" is more like a contrast canzona, with about 6 brief different sections. In these sections imitations, complementary motifs, echo passages, chords and toccata like passage work alternate. Together they form a joyful work that is a pleasure to play.
I play this piece on two manuals, alternating between one hands on different manuals and both hands on the same manual. The idea is to contrast different sounds a bit, and by using two manuals to contrast the location of the sound. After all, this music was probably composed by the master of the cori spezzati of the St. Mark in Venice.
Score available here: http://partitura.org/index.php/giovanni-gabrieli-fuga-colorata