To perceive art is to relate to it through the senses. In these works, artists create experiences that are contingent on our participation, inviting us to walk in front of, through, or inside the work, to touch it, handle it, or change its shape. Through interaction with a work of art, we can alter our perception not only of the work but of the world at large. In this way, art can become a catalyst for social change and self-knowledge.