Organic in art can refer to shape, line or material.

Organic Shapes:

Organic or free-form shapes are shapes that are not bound or restricted by any rules. They do not comply to a standard, nor are they defined by the principles of design. Natural and not man-made, organic shapes resemble objects and elements that we find in nature. Keen examples of organic shapes include clouds, trees, mountains and leaves. Even though a leaf or a tree can have defined lines, they are considered organic because their shapes are not geometric or mathematical, they are irregular.

Organic Lines:

Organic lines are lines that appear natural, irregular, asymmetrical, out of order, contorted, against the established rules, instinctive and natural rather than formal, dignified, congruous, symmetrical and measurable. These lines tend to be structureless, they are chaotic, lawless and disorganized, and they don’t follow any established path or adhere to the principles of design that the other elements in the picture plane are submitted to. In essence, organic lines are loose, liberal, indecent and abrupt like those found in nature.

Organic Materials:

Organic materials are found in nature or man-made materials that have been exposed to the natural elements (wind, rain and earth) for a considerable time and hence have lost their identity, shape, form and color and even size. Also referred to as found materials, organic materials are commonly found in the forest and in scrapyards, dumpsites, abandoned buildings and condemned construction sites. Organic material includes: corroding metal fragments, rustic wire, animal hides, bones, shells, broken glass, twigs, discarded paper, wood, feathers, waxes and tree bark.