Give everybody training in a particular skill during their childhood: Juggling, acrobacy, calligraphy, drawing, playing a particular instrument—or even something more esoteric like doing figures with a Yoyo or a Diabolo, or doing pool tricks, or tricks with a socker ball; anyway something require a good amount of motor skills and training; and also make sure that no cohabitor pair has skills that are too similar (like calligraphy and drawing, or acrobacy and soccer tricks, or the violin and the bass).
Then have a taboo against learning those skills outside the “official” (or religious) context in childhood (for example: being seen training for them is a crime, the props can’t be found outside special temples, etc.).
Give everybody training in a particular skill during their childhood: Juggling, acrobacy, calligraphy, drawing, playing a particular instrument—or even something more esoteric like doing figures with a Yoyo or a Diabolo, or doing pool tricks, or tricks with a socker ball; anyway something require a good amount of motor skills and training; and also make sure that no cohabitor pair has skills that are too similar (like calligraphy and drawing, or acrobacy and soccer tricks, or the violin and the bass).
Then have a taboo against learning those skills outside the “official” (or religious) context in childhood (for example: being seen training for them is a crime, the props can’t be found outside special temples, etc.).