Unfamiliar with the Indigo Arts Alliance? Then operate – never walk – to the Institute of Contemporary Art (ICA) at Maine College or university of Art & Style and design. The vitality this organization provides to our local community and to the Maine arts scene is vibrantly on display in the exhibition “Visions of Our Long term Echoes of Our Previous: Dianne Smith, Nyugen E. Smith, and Carl Joe Williams” (by May perhaps 6). Indigo supports the “development and amplification of Black and Brown thought-management, inventive eyesight and observe.” Its main program, artist residencies, brought these multimedia artists to Portland and, now, to the ICA, which is presenting the work…