Molecular graphics is the discipline and philosophy of studying molecules and their properties through graphical representation. IUPAC limits the definition to representations on a "graphical display device". Ever since Dalton's atoms and Kekulé's benzene, there has been a rich history of hand-drawn atoms and molecules, and these representations have had an important influence on modern molecular graphics.
A pair of CrystalEyes shutter glasses
In chemistry, the CPK coloring is a popular color convention for distinguishing atoms of different chemical elements in molecular models.
A plastic ball-and-stick model of proline. These models usually comply with CPK coloring.
Hofmann's methane model
A box of ball-and-stick model pieces colored to represent several of the common elements.