The heads refer us to the natural process of mutation, selection. They would be similar, almost identical, if their genesis kept them original without stimulation and contamination.
They are forms chosen to form an unequal pattern, mold to the most hostile environment and accommodate to the most favorable, adapt, spend.
They are hybrid pieces, generated between matter and its absence, between the physical and the virtual, in an experience of conception that alerts us to the way we rehearse a parallel reality.