In conceptual art the idea or concept is the most important aspect of the work… if the artist carries through his idea and makes it into visible form, all the steps in the process are of importance. The idea itself even if it is not made visible, is as much a work of art as any finished product. All intervening steps - scribbles, sketches, drawings, filed works, models, studies, thoughts conversations- are of interest. Those that show the thought process of the artist are sometimes more interesting than the final product.
Sol LeWitt, Paragraphs on Conceptual Art