Kahlil Joseph’s multi-sensory film takes inspiration for W.E.B. Du Bois’s dream — unfinished at the time of his death, but realized decades later by a group of scholars led by Henry Louis Gates — of creating an Encyclopedia of the African and African-American Experience. Acting more as chief curator or executive producer than a typical film director, he assembles a richly textured visual album for the screen that includes a long list of talented filmmakers, collaborators, and guest stars.