A modular organizer includes a plurality of walls, two faceplates, and a plurality of shelves. In a storage mode, the walls and shelves of the organizer are stored within the containing walls of the faceplates. The containing walls of the faceplates are each equipped with an exterior edge that presents an uneven outline. When the uneven outlines of each faceplate are positioned adjacent each other, a substantially sealed interface is created containing the walls and shelves within. In an organizer mode, the walls are supported by, and serve to separate the faceplates. The shelves are placed within the structure formed by the walls and are positionable between a display and storage position. Each faceplate of each modular organizer is identically configured to incorporate at least one post and hole pair. When one modular organizer is placed adjacent another, the post of one engages the hole of the other and vice-versa allowing a user to fashion virtually any desired modular organizing unit to fit a specific space, e.g., side-by-side, top-to-bottom and bottom-to-top positioning of multiple modular organizers.