The subject of Robert Adams' (born 1937) latest book is a little-visited forest reserve near the photographer's home in Oregon. Sunlight plays a pivotal role in this sequence of pictures, as it pierces through the canopies of branches and leaves to reveal the hidden shapes and structure of the forest and the well-trodden path ahead. Shadows, too, are prominent in these pictures, adding gentle drama and contrast; they occlude the way forward, rendering it a portal to a destination unknown. These images, made between 2012 and 2013, constitute a lyrical meditation on walking and the natural world.