Patent ID: 8136325

Claim:
A wall structure for use in landscaping and comprising: a lower block having a first front surface, a first rear surface, and opposite first side surfaces, said lower block having a substantially planar upper surface with a single recess having an open rear end and extending substantially from said first rear surface to a rear facing edge formed thereby and directed toward said first rear surface; said rear facing edge extending horizontally from said first rear surface; an upper block having a second front surface, a second rear surface, and opposite second side surfaces, said upper block having a substantially planar lower surface with a curved and convex depending lip extending from said lower surface at said second rear surface and forming a single front facing edge directed toward said second front surface, said front facing edge proximate to said second rear surface; said upper block being positioned on said lower block with said front facing edge engaged with said rear facing edge at a rearward zone of contact therebetween, said rearward zone of contact being presented at said first and second rear surfaces; and said upper block being set back and rotated about a rearward rotational axis of said lower block at said rearward zone of contact with said second front surface spaced angularly from said first front surface selected from a range of angles.