This document provides definitions and examples of key art vocabulary terms related to 2D shapes and concepts. It defines shapes like geometric, rectilinear, curvilinear, organic, positive, negative, and composite shapes. It also defines concepts like form, volume, mass, figure and ground relationships, cubism, abstraction, and ambiguity. The document includes example questions to test understanding of different shape types and how specific artists like M.C. Escher, Donald Sultan, and Stacy Seiler explored related concepts in their works.