当你坐在书房时你可能会看见一副美丽的景色：那就是记忆，或者可能是想象。但今天没有任何技术可以让我们以相同的机制把它记录下来。

While sitting in your study you may visualise a beautiful landscape : that is memory, or perhaps imagination. But no technology of today will allow us to record pictures by the same mechanism!