What objects are disappeared within Chapter 6 and what is different about the disppearances in this chapter?

When the island's citizens wake up and feel the familiar sensation associated with yet another disappearance, they go the river and are amazed by the sight that greets them. Somehow every single petal from every single rose on the island has been transferred to the river, creating a beautiful and surreal sight. One of the townspeople even remarks that this disappearance is the most beautiful one that has ever occurred.