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it can vary depending on what art discipline it pertains to. In visual arts, this may pertain to emptiness which may either be positive space or negative space.

refers to a part which is enclosed in a shape

refers to the opposite part which the shape is enclosing

is a series of points.

curved, dotted, or broken

vertical, horizontal, or diagonal

horizontal line usually suggests calmness, as such is the case when viewing the horizon during sunset, vertical lines may convey loftiness, while diagonal lines may pertain dynamism.

is formed by connecting both ends of a line. Shapes are two dimensional figures with height and width

are enclosed figures such as triangle, squares, and other structured figures

are shapes found in nature. They do not have a structured form as they are usually free flowing. Examples of these are the shape of a leaf or a cloud.