Lego began as a wooden toy company in Denmark in the 1890s and started producing plastic toys in 1947. It is best known for its interlocking plastic bricks which were invented in 1949. Since then, Lego has expanded to include thousands of sets across various themes. The precision engineering of the bricks allows them to stick together firmly while being easily separated. Lego pieces are manufactured from ABS plastic in plants around the world. Technological advancements include Lego Mindstorms robotics sets in 1998 and Lego-themed amusement parks which showcase how far the simple plastic bricks have come.