Among the museum shop’s specially designed items:

•  A black and white “Darkness Hoodie” printed with an image of the Twin Towers. The pullover, like other “Darkness” items, bears the words “In Darkness We Shine Brightest.” Price: $39.

•  Silk scarves printed with 1986 photos by Paula Barr, including a panoramic view of the Manhattan skyline. Another depicts “lunchtime on the WTC Plaza.” They go for $95 each.

•  “Survivor Tree” earrings, named after a pear tree that stood in the World Trade Center plaza and survived 9/11. Made of bronze and freshwater pearls, a pair costs $64. A leaf ornament molded from the swamp white oaks at the memorial is said to change from amber to dark brown “and sometimes pink around the time of the 9/11 anniversary.”

•  Heart-shaped rocks inscribed with slogans such as “United in Hope” and “Honor.” One rock bears a quote by Virgil that is emblazoned on a massive blue-tiled wall in the museum: “No day shall erase you from the memory of time.” It costs $39.