The Poppet Shelf is a block from the Witchery mod. This block is used to store Poppets, while still allowing them to perform their voodoo. Poppet Shelves count as chunk loaders, loading whatever chunk they are in constantly. Poppet Shelves are multidimensional, allowing Poppet Shelves to affect players in different dimensions.
Technically, any item can be put into its inventory, however only Poppets will render in-world.