There is in Porto an unexplored and expectant world: the so-called secret gardens inside its blocks. Raising, exploring and cataloging the current state of these inner backyards is a proposal that was presented by Vazio S/A to the City Hall in partnership with the Porto architects Pedro Barata de Castro and Pedro Silva (Anarchlab). The photos below were made during a concert by the Portuguese trumpeter Susana Santos Silva in one of these voids as part of the jazz festival Porta Jazz.