The iotaCenter, a Los Angeles-based organization for the preservation and promotion of abstract film, returns to the HFA with a new compilation of classic and contemporary films that explore the idea of "visual music" in animation. The first program, drawn from archives and the personal collections of the artists themselves, harks back four decades to a moment of radical formal experimentation in America that was prompted, in many cases, by visionary and spiritual explorations. These are works that were influential in expanding the range of visual techniques available to the mainstream cinema, and they served as a catalyst for new generations of experimental animators. The second program offers a selection of works by these later generations.