'Sarah Day’s new book begins with a prose quotation which explains its title. One might think that the moments between outgoing and ingoing tide barely need definition but the passage, in pointing out that though the water surface may appear placid, there are likely to be important and often conflicting currents running underneath, fits Day’s poetry so perfectly that you can see why it was included. Day has always been a poet sensitive to the complex phenomenon that might be called “what lies beneath” and the way in which this interacts with what lies on top. The title poem of her first book, A Hunger to be Less Serious, is a description of traffic being halted at a canal bridge which opens to let a boat pass through. It’s an emblematic scene that is rich with allegorisable possibilities: the drivers and passengers leave their cars to watch the boat pass serenely at eye-level, “carrying on board a gleaming catch / of strayed dreams and wish-fulfilments”, for example. But it is also a scene in which the drivers imagine driving onto the bridge as it opens and then crashing into the water: “The water-surface puckers with the quick current, / underneath, the grey deepens steeply; / its effect is sobering, satisfying”. A memorable poem from a later book, The Ship, describes a town suffering from the subsidence caused by centuries of mining so that when a house is sinking, its occupier “took it as given that a far distant / farmhouse had risen to view from an upstairs window”. Here the cumulative misery of the mining life of the past is what “lies beneath”, as the poem says, “far, far below on thought’s periphery”.' (Introduction)