To constitute desirable design such as pattern or letter on the whole surface of a collective block by fixedly securing a constituting element as a unit constituting the design on the surface of an independent block.

A plurality of independent blocks 1 are combined together to form a laid face, a face of slope, a retaining face. a wall, and the like. At this time, for constituting design such as pattern or letter on the surface of a collective block combined together, a fitting body 5 to be the constituting element of the design is fitted and fixed to the recessed part formed on the surface of the independent block 1. Then design such as continuous pattern or letters is formed on the surface of the collective block. Further, the fitting body 5 is selected from a group constituted of a fluorescent member, a ceramic member, and a colored tile.