In this world, however, jazz and improvised music do have that quality of being a constant undercurrent of thought, imagination, and practice, something that comes through prominently in public at certain times and on certain stages. More than anything else, that’s the fundamental value of the annual Vision Festival, which hit stage and screen at Roulette and The Clemente from June 10 through June 18 with panel discussions, documentaries, and of course a ton of vibrant music.