Physical laws do not exist in this realm of ghosts, save those that a traveler creates for his or herself. Magic and illusion dance across the ever-changing vastness.
The Twisting Nether is highly morphic and little shifts occur all the time in the Twisting Nether, and many changes are caused by the landscape adjusting itself to fit the thoughts of those within it. Think about war and violence and the landscape may become a battlefield populated with undead soldiers. If one is lonely, his lost love may step out of a nearby cottage. The solidity, detail, and potential danger these images possess depend on how well a creature can control its thoughts. If a creature is in control of its thoughts, then images the creature's mind triggers are benign or easily ignored. If it doesn't control its thoughts, then the images that appear are realistic and frightening. Strong-minded individuals may consciously influence the Twisting Nether. The changes made may be subtle or drastic. One can create an image of a dog wandering around the area sniffing others and licking any hand that is presented or place oneself and those nearby at the top of a windswept mountain. A creature cannot create any knowledge that it does not already have. If someone creates a well-appointed library, for instance, the only information in the books is information he already knows. If more than one creature tries to manipulate the environment, the one with the strongest will controls the environment. This control persists until another stronger willed creature changes it. The forces of the Twisting Nether steadily erodes any attempt at a static environment. If someone creates a cozy chalet with a roaring fire on the hearth, he should not be surprised if a few moments later the fire poker has morphed into a duck. A harmful environment created requires all those within the area to be willful to avoid being harmed by it.