There are several ways in which we 'rediscover' things. Sometimes rediscovering means finding something we had thought lost—to take a relevant example, let's say a painting that was stolen, or thought destroyed, that turns up in a dingy attic, from where it is rescued, and then authenticated, valued and preserved, finally restored to its rightful place. In such an instance, there will be a place waiting for the rediscovered painting from where it has been missing, and known to have been missing; a blank space on a gallery wall. Rediscovery, in this mode, is a kind of restoration
