| 摘要 |
A building block includes three serially connected square frames, each of which has an outer frame portion and an inner cross-shaped located within the outer frame to divide a space enclosed in each square frame into four equal parts. The cross-shaped rib portion has a thickness at least twice as large as that of the outer frame portion. All the three square frames have two diagonally opposite cavities provided thereon, while one of the three square frames further has two connecting protrusions diagonally located at two sides of the two cavities, so that multiple pieces of the building blocks could be assembled together in different manners to form changeful shapes via engagement of the cavities with corresponding connecting protrusions.
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