Tricomatic is a structured improvisation in three short movements. It is scored for piano, cello, percussion, video, and tape. The piece is freely based on the notion that human color vision involves three types of retinal sensory receptors. Each movement highlights one instrument in the ensemble, and the sonic material for the “soloist” is derived primarily from the color, speed, and mood of the video, creating a loosely defined part for the “soloist.” In each movement, a rhythmic map, predetermined by edit points in the video, creates a score for the ensemble. This rhythmic map connects the video with the ensemble while leaving space for each ensemble member to make sonic choices. The video images are not intended to provide a narrative, but are used to create the energy, mood, and space for improvisation. The California Ear Unit originally commissioned Tricomatic for the ensemble’s 2004 performance season. After the original performance, Ear Unit percussionist Amy Knoles developed a solo version for her performance repertoire. Ear Unit pianist Vicki Ray and Amy Knoles also premiered a duo version of Tricomatic at REDCAT in Los Angeles in the Spring of 2008.