Retroreflector

A retroreflector comprising:

• a regular arrangement of multiple reflective triples of a first type, each triple having first, second, and third side surfaces of the first type approximately perpendicular to one another, in pairs, and defining a cube corner having an apex;
• wherein the first, second, and third side surfaces of the first type extend in first, second and third planes, respectively, intersecting in the apex;
• wherein each triple of a first set of selected triples of the first type has a recess or an elevation forming a triple of a second type;
• wherein each triple of the second type has at least first, second, and third side surfaces of the second type approximately perpendicular to one another, in pairs;
• wherein each triple of the second type is neither positioned in the apex of the respective triple of the first type nor positioned at a low point between triples of the first type;
• and
• wherein the first, second, and third planes respectively spanned by the first, second, and third side surfaces of the first type of three adjacent triples of the first type intersect at the low points.