What's the name of this toy? . . 1 1 stick 1 sphere, which is an educational toy.

According to legend, Kongmingsuo was a toy invented by Zhu Gekongming in the Three Kingdoms period according to the principle of Eight Diagrams Metaphysics, which was once widely circulated among the people. It is the traditional fixed connector of ancient civil buildings in China, also known as "not staying", "six-son couplet", "doing nothing" and "being difficult". Without nails and ropes, it is supported entirely by the connection of its own structure, just like a piece of paper can stand up when folded in half, showing a seemingly simple but extraordinary wisdom.