The LEGO System i Leg Basic Set theme, active during the late 1950s, includes foundational sets that were pivotal in the early development of LEGO's brick system. Notable sets in this theme include the "1234-4 LEGO Mursten System i Leg 1x1 Letter Bricks," which provided small, letter-printed bricks for building and learning, and the "LEGO Bricks Box" from 1958, which offered a variety of basic bricks for creative construction. These sets were crucial in establishing LEGO's reputation for innovative, interlocking bricks that encouraged creativity and learning.
1958 LEGO Sets
1958 was one of the most significant years in LEGO history. Following the death of founder Ole Kirk Christiansen, leadership passed to his son, Godtfred Kirk Christiansen. Most importantly, LEGO patented the modern stud-and-tube brick design, giving the LEGO System its enduring clutch power and near-unlimited stability. This breakthrough replaced earlier hollow-bottom bricks and defined the universal compatibility that remains today. LEGO also unified its packaging under the ‘LEGO System’ name, dropping multilingual text in favor of a consistent global identity.