The 21st century will be the century of superdiversity. Ethnic-cultural diversity in Europe continues to grow, even though governments try to limit further migration with a series of short-sighted measures. In Brussels, the capital city of Belgium and Europe, two out of every three residents has a migration background. Within a matter of years, Antwerp will also become a majority-minority city, as will many other European cities.

How will superdiversity change our society? How can we all mana...