Shape-

 A shape is usually a contained, geometric area that can be defined very easily once looked upon. Some examples of basic shapes could be a square, a circle, a rectangle, a triangle or a rhombus. Usually many designers try to make up shapes that they create to draw attention rather than an ordinary circle. These shapes could be abstract and could look very appealing or ugly and could have psychological meaning. The image above is a smoking restriction sign. The outer shape of it is a circle. Notice that the circle with the slash in the middle emphasizes, "No smoking!", that is its psychological meaning.