Grasshopper—a plugin for the Rhinoceros 3D modeling package—is a graphical algorithm editor that takes advantage of Rhino's existing tools. Grasshopper offers new ways to expand and control the 3D design and modeling processes, including automating repetitive processes; generating geometry through mathematical functions; quickly making changes to complex models; and creating complex forms through repetitions of simple geometry. Grasshopper requires no programming or scripting knowledge, but still allows designers a high degree of flexibility in creating both simple and complex forms. So join author Chris Reilly for this quick course, and get up and running with Grasshopper, fast.