LEGO System i Leg / Basic Sets

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.

System i Leg, which translates to System of Play, was the natural progress of LEGO Mursten and is the foundation of L:EGO sets today. Designed by Godtfred Kirk Christiansen who organized the existing LEGO Mursten sets and modeled new designs around a single, common theme - a townscape or street scene. After nearly a year of development the result was the LEGO Mursten System i Leg (System of Play). The System i Leg was unveiled at the Nürnburg Toy Fair in February 1955. The original Automatic Binding Bricks sets and then LEGO Mursten sets were continued to be manufactured under the System i Leg theme.