Form and shape are visual elements that define objects in space and cannot exist without space. There are various ways to categorize form and shape, including as organic or geometric, and as two-dimensional or three-dimensional. Organic forms are irregular and often asymmetrical, mimicking natural shapes, while geometric forms correspond to regular shapes like squares and circles. Two-dimensional shapes create pictorial compositions in media like painting and photography using outlines, colors, textures and planes. Three-dimensional shapes add the consideration of being viewed and experienced from multiple sides, as in architecture and designed objects.