Illusion it's the sense deception or the mind, which causes a fact or sensation to be misinterpreted.
Illusion is the exchange of real appearance for a false idea. It is also a daydream, a dream, a product of the imagination.
Illusion has the ability to overshadow reason so that reality cannot be discerned from facts. To be deceived is to be deceived. Living an illusion means living a delusion, living a false perception of reality.
The illusion can be caused by external elements, such as the optical illusion, which are all images perceived by the human visual system, which can visualize much more than the reality that is being exposed. The optical illusion is perceived by images that confuse our eyes. If we look closely at a certain point, we will notice some image that was not visualized at the first moment.
Many images are created to confuse human eyes, transmitting distorted vision, deceiving our visual perception. Many geometric paintings, or drawings, give us the illusion of movement, depth, color changes, image formation, etc. 3D movies give us the illusion that images are coming off the screen.