Ghosts have no corporeal form. Yet they are composed of a neural network of exotic energy that can process electromagnetic frequencies, allowing them to 'see and hear' even without a body. They can also manipulate a range of these frequencies often leading to what is typically observed as paranormal activity. It is a mystery whether these abilities are innate or learned. Ghosts also seem to exist in a peculiar quantum state such as particle-wave duality in which they can pass through matter with wave-like properties or change into particles that form a shape an observer can actually see, appearing solid or translucent but often looking as they did at the moment of death. Since ghosts would require energy in order to perform various actions, they seem to possess the capability of absorbing energy from their surroundings. As they interact with their environment, they leave an electromagnetic trace and under the right conditions can create glowing plasmoids, both of which can be detectable.

 

Due to their non-biological nature, ghosts experience time differently which enables them to exist in one location perpetually. A haunting occurs because a ghost cannot 'feel' the passage of time. However, when changes occur in their setting, for instance when a location is remodeled or destroyed, the unfamiliarity may lead the ghost to either resist detachment even further or more likely enter the process of ego dissolution. This process may explain why there are little to no witness descriptions of ghosts from the ancient past, unless these entities reside in a location where the setting has remained largely unchanged.