A stackable concrete wall block is disclosed having a body with an irregular front portion and a prism shaped rear portion, the irregular front portion has a three dimensional surface structure embossed in the front face providing the appearance of natural stone and the regular rear portion facilitating stacking of like blocks. The rear portion has parallel sidewalls perpendicular to a rear wall, which are more easily manufactured by dry casting than tapered sidewalls. A lip protrudes from at least one of the sidewalls of the rear portion and is coplanar with the front face for spacing the body of the block from that of a like block placed adjacent thereto. The lateral lip generates spacing between adjacent blocks at a back terminal edge, thereby allowing the assembly of curved walls. The irregular front face extends over the lip so that the front face is continuous over the lip.

A system for the provision of container blocks of fluid to locations in need of said fluid in which system the containers also function as structural elements. The system further comprises structural elements that complement the fluid container blocks, including base tracks, roof rafters, roof material, door and window flap materials. Connecting clips and anchoring spikes function to secure the fluid blocks together and to the ground to form a solid structure. The system provides the means to deliver an emergency supply of water or other fluid to a disaster area or underdeveloped location along with the means to erect temporary structures for shelter using the container blocks as the basic structural element.

Disclosed is an economical and effective way of producing a modular retaining wall for a material to be retained, using backer blocks and facing blocks which are stacked into continuous front and back wall components connected by separate connectors in a back to back, spaced apart arrangement, thereby forming a hollow retaining wall. The hollow wall is filled with loose filler material to increase the mass and retaining capacity of the wall. None of the wall components is embedded in the material to be retained. The facing blocks, connectors and filler material are all separated from the material to be retained by the backer blocks. Further disclosed are wall components and a wall kit for a modular retaining wall. A double sided decorative wall is also disclosed. The modular wall system allows for the construction both straight and curved retaining walls.