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Optical illusion: A mirage in the desert
An optical illusion is characterized by visually perceived images that differ from objective reality.
![](https://images.caxton.co.za/wp-content/uploads/sites/26/2016/04/caravans-crossing-the-sahara5.jpg)
A mirage is an optical illusion caused by atmospheric conditions, especially the appearance of a sheet of water in a desert or on a hot road caused by the refraction of light from the sky by heated air.
![Fezzan, Libya --- Mirage and Caravan --- Image by © Kazuyoshi Nomachi/Corbis](https://albertonrecord.co.za/wp-content/uploads/sites/35/2016/04/Corbis-42-15983745-520x400.jpg)
The mirage scene from Lawrence of Arabia