Microprismatic retroreflective mold, sheet, and article and methods of manufacture thereof

An article, comprising:

• a transparent sheet having a first side with a structured surface, wherein:
• the structured surface includes microprisms thereon, the microprisms being part of a microprism array on the structured surface;
• and
• each one of the microprisms are part of a quaternary set of the microprisms, such that for each quaternary set:
• the first microprism has a first lateral face, a second lateral face, and a third lateral face,
• the second microprism has a first lateral face, a second lateral face, and a third lateral face,
• the third microprism has a first lateral face, a second lateral face, and a third lateral face,
• the fourth microprism has a first lateral face, a second lateral face, and a third lateral face,
• there is a continuous surface transition between the second lateral face of the first microprism and the third lateral face of the second microprism and between the second lateral face of the third microprism and the third lateral face of the fourth microprism,
• there is a shared side edge between the second lateral face of the first microprism and the third lateral face of the third microprism and between the third lateral face of the second microprism and the second lateral face of the fourth microprism, and
• the shared side edge is visible as a solid tooling line.