Barrel

A barrel comprises:

• a sector-shaped main board and a polygonal base board,
• a plurality of periphery plates disposed on a periphery of the polygonal base board,
• each of the periphery plates having a periphery folding line and a round hole,
• the sector-shaped main board having a plurality of longitudinal folding lines, a connection plate and a plurality of rectangular plates defined by the longitudinal folding lines, and a plurality of decoration plates connected to the rectangular plates,
• the connection plate having a plurality of round apertures,
• each of the rectangular plates having a slot and at least a circular aperture,
• each of the decoration plates having a transverse folding line and an insertion protrusion,
• the sector-shaped main board folded along the longitudinal folding lines,
• the connection plate and one of the rectangular plates fastened together,
• each of the decoration plates folded along the transverse folding line and the insertion protrusion of the decoration plate inserted in the corresponding slot of the rectangular plate,
• each of the periphery plates folded upward along the periphery folding line to match the corresponding rectangular plate, and
• each of the periphery plates and each of the rectangular plates fastened together by a bolt and a nut engaging with the bolt.