“Memory is the enemy of wonder, which abides nowhere else but in the present. This is why, unless you are a child, wonder depends on forgetting—on a process, that is, of subtraction. Ordinarily we think of drug experiences as additive—it’s often said that drugs “distort” normal perceptions and augment the data of the senses (adding hallucinations, say), but it may be that the very opposite is true—that they work by subtracting some of the filters that consciousness normally interposes between us and the world.”