What are optical illusions and why do we like them so much?

9 Optical Illusions to Confuse Your Brain – Scout Life magazine

How Do Optical Illusions Work?

The Müller-Lyer Illusion Explained

The neuroscience of optical illusions, explained - Vox

Creativity

Classic Optical Illusions That Stump Everyone

Xenses

30 Optical Illusions That Will Make Your Brain Hurt

How Does the Human Eye Interpret Optical Illusions?

11 Optical Illusions Found in Visual Design, by Circ Cular