An empty space left over from work on the provisional Sant Antoni market which, prior to traffic returning there – or to prevent its return there – offers an opportunity for regeneration, through instantaneous renaturation. Can we imagine a temporary forest that opens an urban ecosystem in the centre of a section in Ciutat Vella, offering various opportunities for creating modes of co-habitation between the city’s residents and non-human inhabitants there which represent recognition of our links of inter-dependence? The relationship with the Mercat de Sant Antoni’s own space, with the Sant Antoni superblock and the block interior of the Biblioteca Sant Antoni - Joan Oliver likewise enables an exploration of the vocabulary of the new green spaces, which are no longer seen as recreational spaces but as infrastructures for urban health and intersection and friction spaces between species.