Fourth Cone Restoration is a women-owned small business dedicated to the restoration and conservation of vintage posters, prints, works on paper, collectibles, ephemera, and objets d'art. We have over 20 years' combined experience in various linenbacking and restoration studios around the country. No matter what your vintage poster or artwork needs, we have the solution. Serving collectors, dealers, framers, galleries, and museums. The name Fourth Cone refers to the color-sensing cells in the human eye. While almost all people have three types of cones, there is a small percentage of people who have a fourth. This additional cone enables them to perceive a wider variety of colors.