Encyclopedia says that Lego bricks are a kind of plastic bricks invented by Danish Olkok christiansen. They have protrusions on one side and grooves on the other, and there are more than 300 shapes, each with 12 different colors, mainly red, yellow, blue, white and black.
It relies on children's brains and hands-on, and can spell out endless shapes, which makes people fondle it. It is called the magic plastic building block. Most Lego bricks have two basic components-the upper protrusions and the inner holes.