A developer has created a collection of 40 CSS-only optical illusions on CodePen, exploring visual tricks with color and motion. The project features animated effects, color manipulations, and interactive demos. Many include motion warnings due to their dizzying nature, highlighting the creative potential of modern web styling.

These illusions demonstrate how CSS can manipulate perception without complex JavaScript. Examples include the Mainz-Linez effect, where red dots shift from vertical to wavy motion when focusing on crosses. Another shows gray circles appearing colored through overlapping hues, proving the brain's role in color interpretation. The collection pushes front-end design boundaries.

The developer used tools like a wave shape generator from @afif and plans to expand the series. This project serves as both a creative showcase and a technical exploration of CSS capabilities. It underscores how developers can create engaging, interactive experiences with lightweight code, offering inspiration for other web designers and developers.