From Svetlana Boym’s The Future of Nostalgia:

Modern nostalgia is a mourning for the impossibility of mythical return, for the loss of an enchanted world with clear borders and values; it could be a secular expression of a spiritual longing, a nostalgia for an absolute, a home that is both physical and spiritual, the edenic unity of time and space before entry into history. The nostalgic is looking for a spiritual addressee. Encountering silence, he looks for memorable signs, desperately misreading them.