What’s the difference between a hallucination and an illusion?
Hallucinations are a perception not based on sensory input, whereas illusions are misinterpretations of sensory inputs. In other words, hallucinations involve experiencing something that doesn’t exist.
Illusions happen when you misinterpret something real in your environment.
For example, you might mistake a black bag sitting on a window sill for a black cat. Upon further examination, you realize that it’s a bag and not a cat.