预言被看见以后，未来就开始改变

Galadriel 的镜子没有展示一条已经固定的未来。有些景象还没有发生，有些会因为看见的人试图阻止它，反而永远不会发生。预言一旦进入行动，原来的未来就已经变了。

Sam 看见夏尔的树被砍倒，第一反应是回家，片刻以后还是决定跟 Frodo 走到底。这个过程和 自证预言 不完全一样。后者多是信念改变自己的行为，再把结果推向原先的信念；镜子里的景象可能让人阻止它。它与 二级混沌 更接近，但这里改变未来的是得到信息的个人，不是整个市场或政治系统。

There’s only stars, as I thought,’ he said. Then he gave a low gasp, for the stars went out. As if a dark veil had been withdrawn, the Mirror grew grey, and then clear. There was sun shining, and the branches of trees were waving and tossing in the wind. But before Sam could make up his mind what it was that he saw, the light faded; and now he thought he saw Frodo with a pale face lying fast asleep under a great dark cliff. Then he seemed to see himself going along a dim passage, and climbing an endless winding stair. It came to him suddenly that he was looking urgently for something, but what it was he did not know. Like a dream the vision shifted and went back, and he saw the trees again. But this time they were not so close, and he could see what was going on: they were not waving in the wind, they were falling, crashing to the ground. Remember that the Mirror shows many things, and not all have yet come to pass. Some never come to be, unless those that behold the visions turn aside from their path to prevent them. The Mirror is dangerous as a guide of deeds. Sam sat on the ground and put his head in his hands. ‘I wish I had never come here, and I don’t want to see no more magic,’ he said and fell silent. After a moment he spoke again thickly, as if struggling with tears. ‘No, I’ll go home by the long road with Mr. Frodo, or not at all,’ he said. ‘But I hope I do get back some day. If what I’ve seen turns out true, somebody’s going to catch it hot!’ J. R. R. Tolkien, The Fellowship of the Ring

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