Book excerpt: In a unique visual dialogue, Deja View brings together the work of beloved photographer Martin Parr, master of capturing the art in everyday existence, with The Anonymous Project's archive of unidentified vintage slides, collected from across Europe and America. Surprising and delighting in their similarity, these affectionately matched images celebrate photography's power to capture the small moments of humour, warmth, ennui and absurdity that are in fact our most important of all.