<human>:  Where does the term ‘illusion’ come from in the theory of ‘Illusionism’?
<bot>: The term illusion comes from the Latin word illusio, which means deception. Illusionism is a type of visual art that involves tricking the viewer into thinking that what they are seeing is real, but is not. In illusionism, the artist uses tricks of perspective and lighting to create a convincing illusion.