Landscaping wall structure and form

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 flat upper surface with a single recess having an open rear end and extending from said first rear surface to form a rear facing edge directed toward said first rear surface and spaced closer to said first rear surface than to said first front surface, said rear facing edge being straight;
• an upper block having a second front surface, a second rear surface, and opposite second side surfaces, said upper block having a flat lower surface with a depending lip extending from said second rear surface and forming a single front facing edge directed toward said second front surface and spaced closer to said second rear surface than to said second front surface, said front facing edge being curved and convex;
• 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 rotated about a rearward rotational axis of said lower block with said second front surface at an angle relative to said first front surface selected from a range of angles.

A wall structure for use in landscaping and comprising:

• a lower layer formed by a plurality of lower blocks positioned in side-by-side relation;
• each of said lower blocks having a first front surface, a first rear surface, and opposite first side surfaces, said lower block having a flat upper surface with a single recess having an open rear end extending from said first rear surface to form a rear facing edge directed toward said rear surface and spaced closer to said first rear surface than to said first front surface, said rear facing edge being straight, the first front surfaces of adjacent lower blocks having a selected angular relationship to form a selected contour of said lower layer;
• an upper layer formed by a plurality of upper blocks positioned in side-by-side relation on said lower layer;
• each of said upper blocks having a second front surface, a second rear surface, and opposite second side surfaces, said upper block having a flat lower surface with a depending lip extending from said second rear surface and forming a front facing edge directed toward said second front surface and spaced closer to said second rear surface than to said second front surface, said front facing edge being curved and convex, the second front surfaces of adjacent blocks having respective angular relationships to substantially match said contour of lower blocks therebelow;
• and
• each of said upper blocks being positioned on at least one lower block with the front facing edge of the upper block engaged with said rear facing edge of said lower block at a respective rearward zone of contact therebetween, said upper block being rotated about a rearward rotational axis of said lower block with said second front surface of said upper block at an angle relative to said first front surface of said lower block, said angle being selected from a range of angles.