QUOTE : It is as transforming and creative beings that humans, in their permanent relations with reality, produce not only material goods--tangible objects--but also social institutions, ideas and concepts. Through their continuing praxis, men and women simultaneously create history and become historical-social beings. Because--in contrast to animals--people can tri-dimensionalize time into the past, the present, and the future, their history, in function of their own creations, develops as a constant process of transformation within which epochal units materialize.