We live with such easy assumptions, don’t we? For instance, that memory equals events plus time. But it’s all much odder than this. Who was it said that memory is what we thought we’d forgotten? And it ought to be obvious to us that time doesn’t act as a fixative, rather as a solvent. But it’s not convenient—it’s not useful—to believe this; it doesn’t help us get on with our lives; so we ignore it.