This three-piece kit pairs a mirror peekaboo knob puzzle, a spinning drum, and a rainbow fabric ball to create a cohesive shelf rotation for infants in the 4–12 month range, addressing object permanence, cause-and-effect, and sensory exploration across a single purchase. Each object is sized and weighted appropriately for early grasp development, and the mirrored surface of the puzzle supports self-recognition, a key milestone in the infant Montessori environment. Having these three materials bundled is useful for setting up a new infant room or refreshing a shelf that needs materials aligned to a specific developmental window.