The LEGO System i Leg Mosaic theme, introduced in the mid-1950s, focused on creating artistic designs using small, colorful tiles. This theme includes sets such as the "1300 LEGO Mosaik Set Small" and the "1301 LEGO Mosaik Set Large." These sets allowed builders to create detailed mosaics by arranging 1x1 tiles on a baseplate, encouraging creativity and fine motor skills. The 1300 set provided a smaller selection of tiles and simpler designs, while the 1301 set offered a larger variety of tiles for more complex and detailed mosaics. This theme showcased LEGO's versatility beyond traditional building, promoting artistic expression and design.

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.
Theme / Subtheme System i Leg / Mosaic
Year 1955
Pieces 47
Availability Retired
1300 Mosaic Lego Mosaik Set Small
Theme / Subtheme System i Leg / Mosaic
Year 1955
Availability Retired
1301 Mosaic Lego Mosaik Set Large
Retail $7.85