"See/hear things" is a common phrase used to describe experiencing something that isn't objectively there. This can range from hallucinations to hyper-awareness of subtle sensory inputs. Synonyms for this phenomenon include: 1. Perceive: To become aware of something through the senses. 2. Visualize: To create a mental image of something. 3. Imagine: To make a mental image of something that isn't perceived through the senses. 4. Hallucinate: To experience something that isn't objectively there. 5. Delude: To trick or deceive oneself into believing something is real. 6. Conjure: To bring something into existence through imagination or magic. 7. Dream: To experience events and sensations while asleep. These synonyms offer a range of descriptions for seeing or hearing things beyond objective reality, from simple awareness to fantastic imaginings.