For centuries, the study and findings of anatomy have traditionally been recorded in anatomical atlases—books of two-dimensional pictures representing three-dimensional structures. The early atlases contained idealized illustrations of anatomical features to give the viewer some sense of their three-dimensionality. Many modern atlases use photographs of actual dissections. These often contain artist renderings in order to make the photographs more understandable. Still, all atlases rely on two-dimensional art forms to represent complicated three-dimensional structures.