Nowadays, of course, decades after my own youth, LEGO has broadened and deepened its offerings to include an infinity of models and expansion kits, elaborate parts and figures and robotic components, as well as narrative-based packages (Bionicles) and online games and design tools. But at the heart of the experience remains the Holy Brick, with its satisfying capacity to mate ingeniously and heterogeneously with its own kind, according to the builder’s creativity.