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Retroreflective sheeting and a method for making the same includes a plurality of open-faced cube-corner surfaces formed from a substantially rigid material to keep the cube-corner surfaces from flexing. An optical coating is formed on the surfaces, and a fill layer is attached to at least a portion

Retroreflective sheeting and a method for making the same includes a plurality of open-faced cube-corner surfaces formed from a substantially rigid material to keep the cube-corner surfaces from flexing. An optical coating is formed on the surfaces, and a fill layer is attached to at least a portion of the optical coating. A plurality of voids form the open-faced cube-corner surfaces.

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1. Retroreflective sheeting, comprising:a) a plurality of first open-faced cube-corner surfaces formed from a substantially rigid material to keep the first cube-corner surfaces from flexing, the first cube-corner surfaces being disposed on a first side of a carrier substrate;b) a plurality of secon

1. Retroreflective sheeting, comprising:a) a plurality of first open-faced cube-corner surfaces formed from a substantially rigid material to keep the first cube-corner surfaces from flexing, the first cube-corner surfaces being disposed on a first side of a carrier substrate;b) a plurality of second open-faced cube-corner surfaces formed from the substantially rigid material to keep the second cube-corner surfaces from flexing, the second cube-corner surfaces being disposed on a second side of the carrier substrate; andc) an optical coating disposed on at least some of the first and second cube-corner surfaces, light incident on the optical coating being retroreflected without passing through the substantially rigid material.2. The sheeting of claim 1, wherein the optical coating includes a specular coating.3. The sheeting of claim 1, wherein the optical coating includes a low index of refraction dielectric material.4. The sheeting of claim 3, wherein the index of refraction is in the range of between about 1.1 and 1.3.5. The sheeting of claim 1, wherein the substantially rigid material is selected from a group consisting of thermoplastic and thermoset polymers.6. The sheeting of claim 5, wherein the polymers further include a filler which is selected from a group consisting of glass, graphite, polymers, and metals.7. The sheeting of claim 1, wherein a plurality of voids form the first and second open-faced cube-corner surfaces.8. The sheeting of claim 7, wherein each void includes three surfaces which meet at a nadir.9. The sheeting of claim 1, further comprising a color coating on at least some of the first and second open-faced cube-corner surfaces.10. The sheeting of claim 1, wherein the sheeting is diced into chips and mixed into or placed on at least one or more of the following: a coating, a paint, a polymer, or an adhesive.11. The sheeting of claim 10, further comprising a top coat covering the at least one of the coating, the paint, the polymer, or the adhesive.12. The sheeting of claim 1, wherein the sheeting is breakable into chips.13. The sheeting of claim 1, further comprising patterns on the retroreflective sheeting having no open-faced cube-corner surfaces.14. The sheeting of claim 13, wherein the patterns form walls in the retroreflective sheeting that extend from the carrier substrate to a prism ridge, the thickness of the walls being in the range of between about 25.4 and 1,270 micrometers (0.001 and 0.05 inches).15. A projection screen which includes the retroreflective sheeting of claim 1.16. The sheeting of claim 1, wherein the substantially rigid material is colored.17. Retroreflective sheeting, comprising:a) a first plurality of three-sided indentations which form first open-faced cube-corners;b) a second plurality of three-sided indentations which form second open-faced cube-corners opposing the first open-faced cube-corners; andc) a reflective coating disposed on at least a portion of the first and second three-sided indentations for retroreflecting light that does not pass through the sheeting.18. The sheeting of claim 17, further comprising a carrier sheet disposed between the first and second open-faced cube-corners.19. The sheeting of claim 17, wherein the sheeting is diced into chips having a length less than about 457 micrometers.20. The sheeting of claim 19, wherein the chips are disposed on or in an adhesive.21. The sheeting of claim 19, wherein the chips are disposed on or in at least one of a coating, a paint, a polymer, or an adhesive.22. The sheeting of claim 17, further comprising patterns in the retroreflective sheeting having no open-faced cube-corner surfaces.23. Retroreflective chip, comprising:a) a structure having a plurality of open-faced cube-corner surfaces formed therein, the structure having a length less than about 457 micrometers and the open-faced cube-corner surfaces are first open-faced cube-corner surfaces and the structure includes a plurality of second open-faced cube-corner surfaces which oppose the first open-faced cube-corner surfaces; andb) a metal layer formed on the surfaces that retroreflects incident light thereon such that retroreflected light does not pass through the structure.24. Retroreflective chips comprising first open-faced cube-corner surfaces having an optical coating thereon, the coating retroreflecting light incident thereon such that light does not pass through the chips and further comprising second open-faced cube-corner surfaces having specular coating thereon laminated to a back side of the first open-faced cube-corner surfaces such that the respective open-faced surfaces face away from each other, each chip having a length less than about 457 micrometers.25. The retroreflective chips of claim 24, further comprising a color coating on at least some of the surfaces.26. The retroreflective chips of claim 24, further comprising a fill layer attached to at least a portion of the optical coating, the fill layer having an index of refraction in the range of between about 1.5 and 1.65.27. The retroreflective chips of claim 24, wherein the first open-faced cube-corner surfaces include different size surfaces on the chips.