The Doppler Effect’s experimental sci-fi show Tribe of One paints an utopian future if you’re into The Greater Good and being in harmony with nature until it begins to grapple with the darker side of morality. Held in new-to-Fringe venue, the Museum of Natural History’s Science on a Sphere room, and featuring two alternating casts as an experiment in gender-neutral casting, you might want to see it twice, to get the full Doppler effect.