The phrase refers to a certain assortment of pages, or comparable medium, distinguished by a visible design aspect that includes an aquatic container populated by fish. This distinctive cowl artwork serves to visually signify or symbolize the content material contained inside. For instance, a novel exploring themes of confinement and statement would possibly make use of this imagery to underscore its narrative issues.
Such a visible motif can present instant thematic cues to potential readers. Its use could improve the marketability of the publication by making a memorable and readily identifiable picture. Traditionally, symbolic representations of enclosed environments have been employed to convey ideas of isolation, artificiality, or the strain between freedom and constraint, and incorporating it on a guide cowl leverages this wealthy historical past.