Edge block and magic cube

The arris block comprises an arris block shell, the arris block shell is provided with two semi-arris block shells, the two semi-arris block shells are detachably connected, each semi-arris block shell is provided with a cavity and an opening communicated with the cavity, a positioning sleeve and a positioning column are arranged on the inner wall of the edge of the opening of each semi-arris block shell, and when the two semi-arris block shells are connected, the two semi-arris block shells are sleeved with the positioning sleeves and the positioning columns. And the positioning column of one half-edge block shell is inserted into the positioning sleeve of the other half-edge block shell, so that the outer surfaces of the two half-edge block shells are in smooth transition at the splicing seam. The positioning sleeves and the positioning columns are arranged on the two semi-edge block shells of the edge block, and when the openings of the two semi-edge blocks are oppositely buckled to define the edge block s