A block set for assembling solid creations uses at least two types of cylindrical blocks. The cylindrical blocks are a thin cylindrical block and a thick cylindrical block. The thick cylindrical block may include a hole on a side face thereof for receiving the thin cylindrical block. A fabricating apparatus for fabricating the thin and thick cylindrical blocks has at least two types of rollers for rolling up paper, and a paper thickness notifying apparatus for notifying the user of the diameter of the cylindrical paper roll on a cylindrical paper roll up core.