  We developed a method of precise isotope labeling to visualize the continuous
growth of graphene by chemical vapor deposition (CVD). This method allows us to
see in real time the growth of graphene monocrystals at a resolution of a few
seconds. This technique is used to extract the anisotropic growth rates, the
formation of dendrites, and the dependence on adsorption area of methane on
copper. We obtain a physical picture of the growth dynamics of graphene and its
dependence on various parameters. Finally, our method is relevant to other CVD
grown materials.
