fabio leone - galadriel's mirror

Many things I can command the Mirror to reveal,’ she answered, `and to some I can show what they desire to see. But the Mirror will also show things unbidden, and those are often stranger and more profitable than things which we wish to behold. What you will see, if you leave the Mirror free to work, I cannot tell. For it shows things that were, and things that are, things that yet may be. But which it is that he sees, even the wisest cannot always tell. Do you wish to look?

J.R.R Tolkien
The Lord of the Rings: The Fellowship of the Ring
(The Mirror of Galadriel)