Ghost in the Shell is a popular Japanese anime franchise that explores themes of identity and consciousness in a futuristic cybernetic society. Synonyms for the phrase "ghost in the shell" can include "presence in the machine," "mind in the circuitry," or "soul in the system." These phrases reflect the concept of a human consciousness or spirit existing within the digital realm of technology. The series follows protagonist Major Motoko Kusanagi, a cyborg with a human brain, as she navigates the complexities of her existence and investigates cyber-crime. Through its exploration of the intersection between humanity and technology, Ghost in the Shell has become a staple in science-fiction media.