Hello, what is the silhouette of the jigsaw puzzle?

It is a kind of intellectual game material. Tangram active silhouette, also known as smart board active silhouette, is a kind of intelligence game material in China, which consists of seven boards with different shapes and sizes, and has many benefits for developing students' intelligence. Tangram was invented by working people in ancient China, and its popularity is probably due to its simple structure, simple operation and easy understanding.