repose of joint filling material in other words for example sand or gravel this means that in practice the angle of the sloping surfaces 26 29 is not greater than 30 u00b0 this downwardly opening cross sectional form of the joints ensures trouble free introduction of the joint filling material over the complete height of the joints to ensure an exact relative position of the paving stones 10 within a paved surface spacers are moulded on at selected positions these are located exclusively in the region of the lower part 16 of the stone and are accordingly not visible from the upper side of a paved surface in the case of the present exemplary embodiment two spacers 36 are arranged at a distance from one another on the outer surface 20 of the projection 18 these bear against an adjacent paving stone in the region of the depression 19 furthermore the two corner projections 25 are respectively provided with a spacer 37 smaller spacers 38 and 39 are provided on the flanks 22 and 23 of the projection 18 on the one hand and the depression 19 on the other hand the spacers 38 on the one hand and 39 on the other hand are positioned in such a way that they.