The uncanny valley is a psychological phenomenon that describes the unsettling feeling of discomfort or revulsion experienced when encountering something that appears almost, but not quite, human. This concept suggests that as robots or other non-human entities become more realistic in their appearance and behavior, they can evoke a sense of eeriness or unease in humans. This is due to our innate ability to recognize and empathize with human-like features, but also our ability to detect subtle differences that make something seem not quite right. The term was coined by robotics professor Masahiro Mori in 1970 and has since been used to explain the discomfort people may feel when interacting with lifelike robots, CGI characters, or even hyper-realistic dolls. The uncanny valley serves as a reminder of the complex relationship between humans and technology, and the fine line between familiarity and the unknown.