The LEGO DUPLO theme was introduced as far back as 1969 and is designed for children ages 1 to 5. It features DUPLO figures which are much larger than minifigures and DUPLO blocks which are about twice the length, width, and height of a standard System brick. Like LEGO System, DUPLO also has subthemes that are often junior versions of System themes, like Pirates and Castle and licensed themes like Disney and Super Heros.
1976 LEGO Sets
In 1976, town-focused play deepened with emergency and civic sets—police, fire, and services—while the train range saw continued refinement of 12V equipment and rolling stock. Basic Building Sets emphasized open-ended creativity. Fully fledged Space and Castle themes would follow in 1978.