Types of Color Pools (GAP)

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: Take a walk,
: Take a swim,
: But stay theefrom a color pool.
: Watch me run,
: Watch me fly,
: But stay thee from a color pool.
: - Sigil children's chant (its age is unknown, but it is ancient, and its meaning has long been forgotten)
Like conduits, more than one variety of color pool exists. Color pools, however, as near as can be determined, do not age. This has to do with the fact that while conduits are a sort of creation or extension of the Astral Plane (or even an intelligent, and at the very least purposeful, force), color pools more than likely result from damage dealt to the Astral. The current chant is that traffic onto and out of the Astral - a plane most contend was never supposed to be visited in the first place - created these holes on the Astral. No one knows for sure of the exact means of this creation, its rate, or whether there are even worse effects yet.
A body could certainly contend that color pools make getting around the multiverse much easier, and the more that there are the better. Some graybeards assert, however, that the amount and intensity of the thoughts that seep onto the Astral from elsewhere are increasing. If this is the fault of color pools, then they are also responsible for the everworsening psychic wind storms (created by the thoughts of those on the planes that touch the Astral).
==One Way==
The vast majority of color pools are leading one-way from the Astral to another plane (never the other way around). They spit a traveler out onto their corresponding plane ignominiously, with no way back. Color pools can lead to virtually anywhere on a plane — into a city center, or out in the middle of nowhere.
==Two Way==
There is no way to determine whether a color pool is one of the very, very rare two-way varieties except through trial and error. The side of the pool that does not open onto the Astral Plane is always invisible.
A few of these rare color pools have been discovered and cataloged, becoming common trading routes onto and off of the Astral. In fact, a few trading towns have been built around these cross over points. Others have been greedily surrounded by fortresses and kept secret.
Some of these color pools are responsible for the presence of nonastral creatures on the plane. There are many stories of wandering beasts, from the Prime or one of the Outer Planes, found on the Astral — everything from owlbears to dragons to imps to chaos beasts.