Unfinished Tales - J. R. R. Tolkien [251]
Alone the palantíri could only ‘see’: they did not transmit sound. Ungoverned by a directing mind they were wayward, and their ‘visions’ were (apparently at least) haphazard. From a high place their westward face, for instance, would look to vast distance, its vision blurred and distorted to either side and above and below, and its foreground obscured by things behind receding in ever-diminishing clarity. Also, what they ‘saw’ was directed or hindered by chance, by darkness, or by ‘shrouding’ (see below). The vision of the palantíri was not ‘blinded’ or ‘occluded’ by physical obstacles, but only by darkness; so they could look through a mountain as they could look through a patch of dark or shadow, but see nothing within that did not receive some light. They could see through walls but see nothing within rooms, caves, or vaults unless some light fell on it; and they could not themselves provide or project light. It was possible to guard against their sight by the process called ‘shrouding’, by which certain things or areas would be seen in a Stone only as a shadow or a deep mist. How this was done (by those aware of the Stones and the possibility of being watched by them) is one of the lost mysteries of the palantíri. 18
A viewer could by his will cause the vision of the Stone to concentrate on some point, on or near its direct line. 19 The uncontrolled ‘visions’ were small, especially in the minor Stones, though they were much larger to the eye of a beholder who placed himself at some distance from the surface of the palantír (about three feet at best). But controlled by the will of a skilled and strong surveyor, remoter things could be enlarged, brought as it were nearer and clearer, while their background was almost suppressed. Thus a man at a considerable distance might be seen as a tiny figure, half an inch high, difficult to pick out against a landscape or a concourse of other men; but concentration could enlarge and clarify the vision till he was seen in clear if reduced detail like a picture apparently a foot or more in height, and recognized if he was known to the surveyor. Great concentration might even enlarge some detail that interested the surveyor, so that it could be seen (for instance) if he had a ring on his hand.
But this ‘concentration’ was very tiring and might become exhausting. Consequently it was only undertaken when information was urgently desired, and chance (aided by other information maybe) enabled the surveyor to pick out items (significant for him and his immediate concern) from the welter of the Stone’s visions. For example, Denethor sitting before the Anor-stone anxious about Rohan, and deciding whether or not at once to order the kindling of the beacons and the sending out of the ‘arrow’, might place himself in a direct line looking north-west by west through Rohan, passing close to Edoras and on towards the Fords of Isen. At that time