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To think that an end to the hostilities would be called the very day after the source of the troubles was defeated...it's almost ridiculously efficient.
Takamichi, Mahou Sensei Negima

It is now, though it was not always, a pretty well-established concept in metaphysics that once something exists, it would take an outside force to make it stop existing. Things, in general, keep existing even when we're not looking at them. We could define "ontological inertia," or object permanence, as some psychology textbooks call it, as the tendency of that which exists to continue to exist.

Fans, and many TV writers, often forget this for some reason, and assume that the creator of a thing maintains some sort of existential tie to the thing created, and his continued survival is necessary. That is, if the creator is destroyed, it is "only natural" that the creation will pop out of existence (or, preferably, explode; see: Load Bearing Boss) along with him. (Clearly, this would be bad news for humanity were it true in general, as children, on average, tend to outlive their parents. It would also mean that whenever the first of anything died, its entire species would be gone forever.) Whatever damage or curse the Big Bad has done disappears when it is defeated. This is a type of Reset Button. Thus, this trope applies to any series or movie where the destruction of the Big Bad instantly results in sunlight, birds and flowers returning to Mordor.

Magic often lacks ontological inertia. Continuous effort has to be applied to keep it working against the natural order of things. Since magic follows its own rules, not necessarily those of standard metaphysics, this is entirely plausible. Few series make it clear why some magic persists, and some does not. It makes sense that a magical construct might break down, but if a mundane object was magically picked up and moved somewhere else, it makes somewhat less sense that it might snap back to its original location. Using this logic, a magical Load Bearing Boss makes sense, as it was its magic that had created the evil lair. This also leads to This Was His True Form in case of Shape Shifting.

Many types of Temporal Paradox hinge on how Ontological Inertia applies when mixed with time travel.

This trope often applies to television and movie illnesses, especially viruses and poisons. Once the patient is given the vital antiserum or antivenin, he is instantly cured, and all symptoms and (more importantly) all lesions, damage to internal organs or neurological damage already caused by the sickness or poison vanish without lasting ill effects within a few hours... sometimes within mere moments, while the audience is watching!

It also occasionally applies to beneficial conditions such as being able to heal oneself or having eternal youth. If someone in a story with no ontological inertia loses their healing powers, their wounds inexplicably return full force and they are incapacitated. Similarly, if they lose the powers that keep them young, they miraculously age up to their actual age and in many cases die. Also if the Weather Control Machine is destroyed, naturally everything will go back to the "default" weather setting of that area regardless of whatever new elements were introduced into the atmosphere to produce these new weather patterns.

Extremely common in fiction, as it results in inarguable victories upon completion of a task. Roll call! When the target is unsuspected, The Enemy Gate Is Down. When the target moves, it's a Golden Snitch. When the target is a person, Ding Dong The Witch Is Dead! When the target is the hero, We Cannot Go On Without You. When it results in a Collapsing Lair, the target is a Load Bearing Boss. When the target applies to warfare, the opponent is a Keystone Army. When the entire world is affected by the target, it's a Cosmic Keystone.

See also Liquid Assets and No Immortal Inertia - though these are more about Life Energy, they still represent states that can be easily restored to "normal".
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