Digital interfaces typically operate in two dimensions, but advancements in CSS now allow for true 3D transformations, providing new possibilities for design. This guide explores how CSS 3D transforms can enhance digital interfaces by drawing parallels to familiar physical objects, such as doorknobs and dials, thereby improving user interaction through familiarity. It covers basic 3D transformations, including translation, rotation, and scaling, all of which operate along three axes, as well as the role of perspective in creating depth. The document also illustrates the application of these concepts through examples like a flipping card and a rotating cube, demonstrating how CSS can be used to create engaging 3D effects. While CSS is not as powerful as dedicated 3D engines, its use can augment interfaces by leveraging users' existing understanding of 3D objects, thus enhancing the overall user experience.