Belén Martínez is one of the three founders of Casa Atlântica, which has two small boutique-cum-workshops in the Gràcia area of Barcelona. Here the trio create and sell handmade homeware pieces and decorative objects inspired by the traditional crafts of Galicia and Portugal using materials such as clay, wicker and wood. Here the designer shares her insider tips for summer 2017 with Rebecca Rhys-Evans.