Scrying (GAP)

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: "We here at the Speck in the Void feel that the best way to watch anything is through a color pool on the Astral. Yes, it's completely safe. These are one-way pools. Can I make a reservation for you?"
: — Thir U-nasha, the tiefling proprietor of an isolated Astral tavern fortunate enough to be built around three different color pools
There's a trick involving color pools which even some well-lanned bloods aren't aware of. A body can concentrate on a color pool and see what lies at its destination point. Canny planewalkers use this ability so that they can look before they leap. Planewalkers being planewalkers, however, a few have learned to squeeze this trick further for an even greater benefit.
It seems that if a body concentrates even harder, he can "move" the point of view given to him through the pool, allowing him to look around a bit. This view can move at the concentrating character's own astral movement rate and can rise, fall, and pivot to allow full viewing. It cannot move through walls or other solid barriers. Viewing inside small spaces, like the interior of a building or subterranean cave, is usually very difficult, even if the point of view is somehow worked in through an open door or some such. This method of spying allows the scryer only visual information. Spells cannot be cast through the color pool.
From the point of view of those on the plane, this scrying pool, or "astral window" as some call it, is completely invisible. It can be detected by spells or similar magic, and powerful godlike creatures can snap the astral window back to its original view with but a thought. Creatures with gaze attacks, like basilisks and their ilk, can inadvertently use these attacks upon the scrying agent.
Concentrating on a scrying pool tires a body, and a blood can only keep it up for ten rounds per point of Constitution. After this, he must rest. At such a time, the position of the astral window remains constant for Id 10 hours, reverting to the destination point of the pool after that. Twenty hours must pass before the pool can be used to scry again.
Since these limitations can really hamper moving the window extremely far, it may be beneficial to find the color pool that opens closest to the area to be viewed, although the search for the best pool may be a lengthy one. If a body's lucky, she might even find two color pools that have their destinations near each other, allowing multiple views of the same location.
No matter where a basher moves an astral window, the destination of the color pool (should someone enter it) remains unchanged. No one's ever figured out how to move them.