Imagery refers to the collection of images contained in a text. Imagery is not purely visual; instead it includes all sensory representations. If a writer makes you smell freshly-baked bread, see the new blade of grass, feel the agony of thirst or the warmth of a radiator on a cold day, then you have been affected by imagery. When you think about it, it seems miraculous that this can be achieved by the tiny squiggles that we call letters.