Ali Smith’s new novel is a meditation on a world growing ever more bordered and exclusive, on what richness and worth are, on what harvest means. This first in a seasonal quartet casts an eye over our own time. Who are we? What are we made of? Shakespearian jeu d’esprit, Keatsian melancholy, the sheer bright energy of 1960s Pop art: the centuries cast their eyes over our own history-making.