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.
1978 LEGO Sets
1978 was transformative: the modern minifigure arrived with articulated limbs and standardized proportions, becoming the heart of LEGO play. Three pillars launched in force—Town, Space, and Castle—bringing buses and services to city streets, astronauts and bases to the cosmos, and knights and keeps to medieval scenes.