Catalogue membership for Orange Crystals crosses material labels including Calcite, Carnelian, Sunstone, and Agate and forms such as tumbled stones, spheres, towers, and bracelets. The collection therefore represents a color axis: entries share the recorded color path while retaining different materials and shapes.
Begin with the recorded material choices, including Calcite, Carnelian, Sunstone, and Agate. After that, compare the shape labels tumbled stones, spheres, towers, and bracelets; both facts vary even though the entries share this color category.