RALEIGH, NC.- Beginning September 10, 2016, the North Carolina Museum of Art presents Reunited: Francescuccio Ghissi’s St. John Altarpiece, the first time in more than 100 years that the altarpiece’s eight known panels—and one recreated missing panel—can be seen and appreciated as one magnificent work of art. The free exhibition will be on view through March 5, 2017.

During the 19th or early 20th century, Ghissi’s St. John Altarpiece was dismantled and sawed apart, and its nine panels were sold separately to art dealers and collectors. Three panels are today in the NCMA’s collection (one panel shown below); one panel is in the Portland Art Museum’s collection; three are in the Metropolitan Museum of Art; and the central Crucifixion panel is at the Art Institute of Chicago. After more than a century of separation, the individual panels travel to the NCMA to be reunited in an exhibition that retells the story of this Renaissance masterwork.

Because the ninth panel has never been found, the NCMA collaborated with Dutch conservation specialist Charlotte Caspers in taking the extraordinary step to re-create the missing panel using 14th-century materials and techniques. Over the course of several months, Caspers worked with NCMA Curator of European Art David Steel and NCMA Chief Conservator William Brown to determine the probable subject, composition, coloring, and other details; then she created the panel with the same pigments and gilding used by Ghissi 650 years ago.

Once the panel was complete, Duke University mathematicians, led by Ingrid Daubechies, developed algorithms to digitally age Caspers’s work by matching crack patterns found in the eight original panels; a digital print of this virtually aged ninth panel will be installed with the original panels to complete the St. John Altarpiece. Using Caspers’s panel, the team at Duke calculated algorithms to guide them in digitally removing the crack patterns from the original altarpiece’s panels and used a color-mapping technique to approximate the original pigments—thus creating a version of the completed altarpiece as it would have looked in the 14th century.

“It was a true collaboration between conservators, curators, and mathematicians,” says Steel. “Everyone learned from each other’s research, and it resulted in this fascinating exhibition that combines art history, mathematics, and technology.”

In addition to the reunited altarpiece, the exhibition features several conservational, interactive, and educational elements, including:

· A virtual recreation of the altarpiece showing how it might have appeared when it left the artist’s workshop circa 1370

· A video documenting the creation of the missing panel

· A display of pigments similar to those used in the Renaissance with their mineral, insect, and plant sources, as well as brushes and gilding tools

· A video exploring the mathematical algorithmic processes Duke University researchers used to virtually age and revitalize the panels

Walking through the gallery, visitors will be able to travel from the 21st century—studying the technology and mathematics used to virtually re-create the panel—back to the 14th century to see the reunited St. John Altarpiece as it originally appeared together with the materials and techniques used by the artist to create it.