A multiple component, interactive growth chart assembled from a plurality of growth chart components. The individual components are preferably building block type, and have means for coupling one component on top of another. The components have a disclosed height, so that a user can calculate the height of a person who is positioned proximate a chart comprised of a plurality of assembled components. Preferably, the components have a heart shape. In one embodiment, coupling means are provided to permit lateral and/or other coupling directions, in addition to straight north-south coupling, so as to provide greater play flexibility.