The LEGO Basic theme, which began in the 1970s, was designed to be a more general, non-thematic series of sets. Unlike the themed sets that revolve around specific stories, characters, or concepts (e.g., space, city, or pirates), the Basic theme provided a collection of standard LEGO bricks and pieces, often in a variety of colors. The goal was to encourage free building and creativity without the confines of a specific theme or narrative.
1973 LEGO Sets
In 1973, LEGO released several new sets and themes, including the LEGO Town theme, which introduced the first minifigures with movable arms and legs. This was a major innovation for LEGO, as it allowed for much more realistic and detailed play scenarios. 1973 was also the year that LEGO introduced the LEGO DUPLO line. In addition to these new products, 1973 saw the release of several other popular LEGO sets and themes, such as the LEGO Castle theme and the LEGO Space theme. These sets, along with the new minifigures and DUPLO bricks, helped to cement LEGO's position as one of the leading toy brands in the world.