Abstract: A building block includes a connecting part, a head part, and a tail part. The head part and the tail part are respectively connected to the connecting part. The head part is assembled with a head part or a tail part of another building block to form a head assembled structure or a head-tail assembled structure. The tail part is assembled with a head part or a tail part of another building block to form the head-tail assembled structure or a tail assembled structure. The building block forms a cyclic semi-structure or a columnar semi-structure with other building blocks by the three assembling methods. The cyclic semi-structure and the columnar semi-structure are assembled with another corresponding cyclic semi-structure or columnar semi-structure to form an annular column or a column by assembling the head assembled structures, the head-tail assembled structures, and the tail assembled structures.

Abstract: A building block monomer includes a connecting part, a head part, and a tail part. The head part and the tail part are respectively connected to the connecting part. The head part is assembled with a head part or a tail part of another building block monomer to form a head assembled structure or a head-tail assembled structure. The tail part is assembled with a head part or a tail part of another building block monomer to form the head-tail assembled structure or a tail assembled structure. The building block monomer forms a cyclic semi-structure or a columnar semi-structure with other building block monomers by the three assembling methods. The cyclic semi-structure and the columnar semi-structure are assembled with another corresponding cyclic semi-structure or columnar semi-structure to form an annular column or a column by assembling the head assembled structures, the head-tail assembled structures, and the tail assembled structures.