Nick Vivarelli International CorrespondentAfter making a splash with “Transparent,” Amazon Prime Video’s Italian original series “Prisma” will keep the navigation of gender identity at its core while catering to a young adult audience and connecting with Italy’s neorealist roots.“Prisma,” which is currently shooting, is set in the city of Latina, just south of Rome, and its surrounding area, which used to be a swamp until the land was drained under Fascist rule.