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Illusions are when your brain plays tricks on you. Imagine looking at a straight stick halfway submerged in water and it appears bent. That's an illusion. It occurs because of how our brain receives and interprets information from our senses. In this case, light bends as it passes from water to air, leading your brain to think the stick is bent. Illusions can happen with all our senses: we might think we hear someone calling our name when it's just the wind rustling, or feel our phone vibrating in our pocket when it isn’t. What makes illusions fascinating is that they involve a **real** external stimulus. The brain just misinterprets it!

Hallucinations are perceptions that feel real but are created by your mind. They can affect any of the five senses. You might see people who aren't there, hear voices with no source, or smell odors that aren't present. Unlike illusions, hallucinations happen **without** any real external stimulus. For example, someone might hear music playing even though there's no music around. Hallucinations can be caused by various factors, including mental health disorders like schizophrenia, sleep deprivation, or even certain medications. It’s important to recognize that hallucinations feel very real to the person experiencing them, even though there's nothing actually triggering those perceptions.

Delusions are false beliefs that are strongly held despite evidence to the contrary. Unlike hallucinations, delusions are about incorrect thinking rather than incorrect perceptions. For example, someone might believe they have a special mission given directly by a higher power, or that they are being followed by a government agency with no proof or reason to support this. These beliefs are often very persistent and hard to disprove to the person holding them. Delusions can be part of various psychological disorders, like delusional disorder or schizophrenia. They often lead to a significant distortion in the way an individual understands reality and interacts with the world around them.