What happens when a stylish psychologist, a modern businessman, and two energetic kids take over a traditionally classic apartment in the heart of São Paulo, Brazil? You get a 3,767-square-foot duplex that manages to be both grown-up and playful – an urban residence that doesn’t take itself too seriously. Karina Passarelli Arquitetura was the mastermind behind the transformation, and the result is a warm, welcoming home that proves you can have design-forward sophistication and where kids can be kids.