Connection surface for a structural unit and method of making same

1. A connection surface disposed on a face of a structural unit, the face of the structural unit extending generally along a plane, the connection surface comprising:

a first segment having a three dimensional surface profile including a plurality of positive outer surface features extending outwardly along a normal direction from the plane and a plurality of negative outer surface features extending inwardly along the normal direction from the plane, wherein at least two of the plurality of positive outer surfaces are separated from one another along both vertical and horizontal directions and at least two of the plurality of negative outer surfaces are separated from one another along vertical and horizontal directions;

a second segment opposing the first segment with respect to an axis;

wherein the second segment is a substantial reflection of the first segment across the axis, but reversed along the normal direction;

wherein when identical connection surfaces face and engage one another in the same vertical orientation, the positive outer surfaces of the first segment nest with the negative outer surfaces of the second segment, and the positive outer surfaces of the second segment nest with the negative outer surfaces of the first segment.

2. The connection surface of claim 1 , wherein the two dimensional surfaces of the first and second segments comprise at least one irregular positive or negative surface feature.

3. The connection surface of claim 2 , wherein the two dimensional surfaces of the first and second segments comprise surfaces having a natural appearance.

4. The connection surface of claim 1 , wherein the first and second segments are adjacent to one another.

5. The connection surface of claim 4 , wherein edges of the first and second segments define a seam; and

wherein the first and second segments have portions removed on or adjacent to the seam.

6. A structural unit comprising:

top and bottom faces;

first and second side faces;

first and second end faces; and

the connection surface of claim 1 disposed on at least one of the faces.

7. The structural unit of claim 6 , wherein the structural unit comprises a structural wall unit.

8. The structural unit of claim 6 , wherein the structural unit comprises a paver, concrete masonry unit, retaining wall block, patio stone, paver, edger, curb, cap, fence panel, precast wall panel, wall covering, interior wall panel, and or revetment mat.

9. A connection surface disposed on a face of a structural unit, the face of the structural unit extending generally along a plane, the connection surface comprising:

a first segment having a three dimensional surface profile including a plurality of positive outer surface features extending outwardly along a normal direction from the plane and a plurality of negative outer surface features extending inwardly along the normal direction from the plane, wherein at least two of the plurality of positive outer surfaces are separated from one another along both vertical and horizontal directions and at least two of the plurality of negative outer surfaces are separated from one another along vertical and horizontal directions;

a second segment opposing the first segment with respect to an axis;

wherein the second segment is a substantial reflection of the first segment across the axis, but reversed along the normal direction;

wherein when identical connection surfaces face and engage one another in the same vertical orientation, the positive outer surfaces of the first segment nest with the negative outer surfaces of the second segment, and the positive outer surfaces of the second segment nest with the negative outer surfaces of the first segment;

wherein the first and second segments define a first pair of segments, and wherein the axis defines a first axis; and

further comprising:

a second pair of segments including a first segment and a second segment, the second pair of segments opposing the first pair with respect to a second axis;

wherein the second pair of segments are a substantial reflection of the first pair of segments with respect to the second axis, but reversed along the normal direction.

10. The connection surface of claim 9 , wherein the connection surface is configured such that, when identical connection surfaces mate with one another, connection profiles are defined along at least two different sections through the mated connection surfaces;

wherein each of the connection profiles defines a 180-degree rotation about a center point.

11. The connection surface of claim 9 , wherein the first and second axes are parallel to one another to provide a book fold between identical connection surfaces.

12. The connection surface of claim 9 , wherein the first and second axes are perpendicular to one another;

wherein the first axis provides a vertical axis and the second axis provides a horizontal axis;

wherein the first and second segments of the first pair of segments provide first and second quadrants, respectively, and wherein the first and second segments of the second pair of segments provide third and fourth quadrants, respectively;

wherein the first and third quadrants are substantial reflections of one another with respect to the horizontal axis, but reversed along the normal direction; and

wherein the second and fourth quadrants are substantial reflections of one another with respect to the horizontal axis, but reversed along the normal direction.

13. The connection surface of claim 12 , wherein the connection surface is configured such that, when identical connection surfaces face one another, the identical connection surfaces nest with one another when the connection surfaces are in the same vertical orientation or reversed in vertical orientation.

14. The connection surface of claim 9 , further comprising:

a third pair of segments including first and second segments opposing one another with respect to the first axis and separated from one another by the first and second pairs of segments, the first segment of the third pair being a substantial reflection of the second segment of the third pair with respect to the first axis, but reversed along the normal direction; and

a fourth pair of segments including first and second segments opposing one another with respect to the first axis and separated from one another by the first and second pairs of segments, the first segment of the fourth pair being a substantial reflection of the second segment of the fourth pair with respect to the first axis, but reversed along the normal direction;

wherein the first segment of the third pair and the first segment of the fourth pair oppose one another with respect to the second axis, the first segment of the third pair being a substantial reflection of the first segment of the third pair with respect to the second axis, but reversed along the normal direction; and

wherein the second segment of the third pair and the second segment of the fourth pair oppose one another with respect to the second axis, the second segment of the third pair being a substantial reflection of the second segment of the third pair with respect to the second axis, but reversed along the normal direction.

15. The connection surface of claim 14 , wherein the first and second segments of the third and fourth pairs of segments are substantially identical to the first and second segments of the first and second pairs of segments.

16. A connection surface disposed on a face of a structural unit, the face of the structural unit extending generally along a plane, the connection surface comprising:

a first segment having a three dimensional surface profile including a plurality of positive outer surface features extending outwardly along a normal direction from the plane and a plurality of negative outer surface features extending inwardly along the normal direction from the plane, wherein at least two of the plurality of positive outer surfaces are separated from one another along both vertical and horizontal directions and at least two of the plurality of negative outer surfaces are separated from one another along vertical and horizontal directions;

a second segment opposing the first segment with respect to an axis;

wherein the second segment is a substantial reflection of the first segment across the axis, but reversed along the normal direction;

wherein when identical connection surfaces face and engage one another in the same vertical orientation, the positive outer surfaces of the first segment nest with the negative outer surfaces of the second segment, and the positive outer surfaces of the second segment nest with the negative outer surfaces of the first segment;

wherein at least one of the plurality of positive or negative surface features in the first segment has a portion removed such that the at least one positive surface feature extends outwardly in the normal direction to a lesser amount than a complementary negative surface feature in the second segment extends inwardly;

wherein when the first and second segments of identical connection surfaces connect with one another, a gap is defined between the at least one positive surface feature and the at least one negative surface feature.

17. A method for providing a connection surface for a structural unit, the method comprising:

providing a primary surface having a three dimensional surface profile along a plane including a plurality of positive outer surfaces extending outwardly along a normal direction from the plane and a plurality of negative outer surfaces extending inwardly along the normal direction from the plane, wherein at least two of the plurality of positive outer surfaces are separated from one another along both vertical and horizontal directions and at least two of the plurality of negative outer surfaces are separated from one another along vertical and horizontal directions;

providing a secondary surface, where the secondary surface is a reflection of the primary surface and reversed along a normal direction;

assembling the primary and secondary surfaces according to a surface reflection pattern along the plane to provide a surface texture; and

forming the provided surface texture on a surface of the structural unit.

18. The method of claim 17 , wherein said providing a primary surface comprises extracting the primary surface from an existing surface.

19. The method of claim 17 , wherein said providing a primary surface comprises generating the primary surface based on one or more parameters.

20. The method of claim 17 , further comprising:

forming a plurality of surface variations on the provided surface texture.

21. The method of claim 17 , further comprising:

selecting a surface reflection pattern;

wherein said surface reflection pattern comprises the selected surface reflection pattern.