The human mind can easily be tricked through illusions, because the mind forms internal models for how it believes the world should be have, the physical properties of the world and as a way to predict various outcomes. This is especially important for our motor skills, depth perception and ability to perform tasks. However, illusions take advantage of these models to trick the mind into believing something that is not true.
One of the most popular examples of this is artworks that seem to be coming alive through the use of perspective. By creating realistic perspectives and framing it in a real environment, the mind will often believe that the scene is 3D and possibly even real. Here are some way cool artworks that illustrate this.