Taking over the baton from their mentor and friend Eduardo Chillida, the architects Juan Carlos Sancho (San Sebastián, 1957) and Sol Madridejos (Madrid, 1958) have pursued a sensitive dialectic between matter and void that lies at the foundations of a fertile formal laboratory, one where the fold is an instrument with great potential in the attainment of structural, spatial, and material coherence. In these pages Arquitectura Viva presents a selection of four Spanish works – ranging from a small chapel to a large educational complex – in which the duo composes variations on the same theme but at different scales, concluding with a coda on a recent international project.