Modular shelf system

A modular shelf system for a bath or shower wall, comprising one or more shelves and a panel, wherein;

• the panel comprises a flange configured to be parallel planar with a bath or shower wall,
• the panel comprises a panel cavity configured to removably receive the one or more shelves, the panel cavity having side surfaces and an inner surface, the panel cavity including a pair of rear panel mating features extending from the inner surface along each of the side surfaces and a pair of forward panel mating features extending from each of the side surfaces proximate a front edge,
• the panel cavity is configured to be recessed within the bath or shower wall,
• the one or more shelves are configured to be removably coupled to the panel cavity via the pair of rear panel mating features and the pair of forward panel mating features,
• the shelf comprises a pair of female shelf mating features, and the pair of rear panel mating features each include a male mating feature configured to removably couple to the female shelf mating features, the male mating feature of the pair of rear panel mating features having a first geometry, and
• the shelf comprises a pair of male shelf mating features, and the pair of forward panel mating features each include a female mating feature configured to removably couple to the male shelf mating features, the female mating feature of the pair of forward panel mating features having a second geometry different than the first geometry.