1. An early-learning system in the form of a manually learner-manipulable structure comprising at least one pair of adjacent, operatively associated, relatively shiftable, learning-information carriers organized, with respect to one another, as dedicated foreground and background carriers having a defined condition of permitted, relative-shifting motion, and visual, partial-learning-element units carried by each of said carriers, each unit which is carried by one of the carriers, through an act involving relative shifting of the two carriers, being combinable visually and selectively with at least one such unit which is carried by the other carrier, thus to form a visual, full-learning element.