History bears this out. In ancient Athens, foreigners known as metics (today we’d call them resident aliens) contributed mightily to the city-state’s brilliance. Renaissance Florence recruited the best and brightest from the crumbling Byzantine Empire. Even when the “extra cultural influx” arrives uninvited, as it did in India during the British Raj, creativity sometimes results. The intermingling of cultures sparked the “Bengal Renaissance” of the late 19th century.
In a 2014 study published in the Creativity Research Journal, Dr. Ritter and her colleagues found that people did not need to participate directly in a schema violation in order to boost their own creative thinking. Merely watching an actor perform an “upside-down” task did the trick, provided that the participants identified with the actor. This suggests that even non-immigrants benefit from the otherness of the newcomer.