In my experience, the only “good thing” about cultural diversity is the historic aspect to draw upon.
Artificial diversity divides with no positive impact.
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Viridian Forest (Pokemon R/B/Y)
Scene 1 (Teenage Mutant Ninja Turtles 3: Manhattan Project)
Rocket Hideout (Pokemon R/B/Y)
And here's some links with connected concepts:
Magic PowersAnd here's something different: