Using technical and artistic processes, artists trained in painting activate a two-dimensional picture plane through the application of wet media such as oil, acrylic, or watercolor. The traditional tool is a paintbrush, but other implements, for example palette knives, sponges, and airbrush techniques can be employed by painters. While paintings are often created on canvas, many artists, both historical and contemporary, have worked on a variety of surfaces. Exploring the elements of design is fundamental to the practice of painting as these methods can be used to create strong compositions. The study of color is particularly central to the development of successful paintings.