How do make an Heart Shaped Lithophane

This sculptural pair of mid-century armchairs was manufactured by the Jasper Chair Company of Jasper, Indiana, an American maker established in 1921 and known for producing high-quality hardwood seating for both commercial and residential interiors throughout the 20th century. At first glance, the sleek lines, tapered legs, and sculpted arms suggested a production date in the 1950s or early 1960s. But once we began the restoration process, the materials confirmed it. Under the original upholster