Process art
Tendency which was broke in the art of the mid-1960 and 1970 and consists in the use of all types of materials (fat, oil, charcoal, yeast, etc.). These forms tend to be organic and amorphous, and opposed to the minimum stable structures of art, often to the finite. The emphasis is in the process of construction or accumulation (stacking, smattering, coiling). American artists such as R. Serra, R. Morris and L. Wiener are perhaps the best known representatives of this kind of art.