Equivalent Exchange
Equivalent Exchange is the blanket term for a type of phenomenon featured prominently in JoJolion. Taking a on variety of forms over the course of the part, the concept of Equivalent Exchange has become a central plot point in the part's overall narrative.
Generally speaking, Equivalent Exchange is the ability for one thing to be traded for something else of equal value. However, the exact mechanics of this principal's application differ depending on how Equivalent Exchange is induced.
Known Mediums Capable of Exchange
Wall Eyes
Main article: Wall Eyes
The area around where the Wall Eyes formed (notably on and around the Higashikata estate) possess a property that can result in Equivalent Exchange under the right conditions. If two subjects are buried together in close proximity to one another, they will undergo exchange with each other, trading seemingly randomly selected parts for other parts of equal value. A notable example of this type of exchange is demonstrated by Kyo Nijimura, who bisects a lemon and a tangerine that had been buried near the Higashikata estate, revealing that corresponding segments of both fruits had been swapped out for one another. So far this method of exchange has only been demonstrated on organic matter. It is unclear weather or not this type of exchange is possible for things that are inorganic.
As stated by Kyo, the Higashikata family has been aware of this method of exchange for generations. This is due to the fact that through unknown means, this type of exchange can be used to transfer the Rock Disease from one host to another
Exchange via the Wall Eyes ultimately lead to the creation of Josuke Higashikata, after his two former identities were buried near the Wall Eyes in the midst of Kira being healed by the New Locacaca he and Josefumi had cultivated. It should be noted that while this type of exchange is seemingly equivalent, the matter which is exchanged does not always directly correspond (the most notable example being the fact that Josuke retains both Josefumi and Kira's pairs of testicles post-exchange.)
