Abstract: An interlocking hollow body configured and arranged with integrally formed and partially laterally overlapped upper and lower generally rectangular sections which form (a) a central commons portion, (b) a cantilevered portion of the upper section projecting from a first side of the body, and (c) a cantilevered portion of the lower section projecting from a second side of the body. The body has (i) a decorative front surface on the upper and lower sections, (ii) a rear surface on the upper and lower sections, (iii) laterally offset first ends on the upper and lower sections, (iv) laterally offset second ends on the upper and lower sections, (v) an underside of the upper section between the laterally offset first ends on the upper and lower sections, and (vi) a top of the lower section between the laterally offset second ends on the upper and lower sections. A protrusion projects from either the underside of the upper section or the top of the lower section.