Shapes 
A geometric figure such as a square, triangle, or rectangle. The external form, contours, or outline of someone or something. Squares, rectangles, circles, triangles and crosses are geometric shapes. Organic shapes are those that often represent things found in nature. These shapes are more free-flowing and less symmetrical. Organic shapes often represent things such as leaves, rocks, clouds and even elements such as an ink blot. In the visual arts, shape is a flat, enclosed area of an artwork created through lines, textures, colours or an area enclosed by other shapes such as triangles, circles, and squares. Likewise, a form can refer to a three-dimensional composition or object within a three-dimensional composition. The 5 basic shapes in art is Circle, square, triangle, oval, rectangle, parallelogram, trapezoid, pentagon, pentagram, hexagon, and octagon. Form and Shape are related.
