Abstract: A plaything including unit blocks connected to each other using a connection tube is provided. Each unit block includes a spherical capsule and a plurality of connection members protruding at regular angular intervals from the surface of the spherical capsule. A shock detector emitting light in response to an external shock is installed inside the unit block. When connecting the unit blocks, the connection members of different unit blocks are inserted into the same connection tube from opposite directions. A structure formed by only one unit block or by connecting two or more unit blocks may be used as an educational tool or a shaking tool shaken in a manner of jig fishing.