Habermas
            A major 'moment' in the history of postmodernism  is the influential paper 'Modernity - an Incomplete Project' delivered by the contemporary German theorist Jurgen Habermas in 1980.  For Habermas the modern period begins with the Enlightenment, that period of about one hundred years, from  the mid-seventeenth to the mid eighteenth century.  when a new faith arose in the power of reason to improve human society.  Such ideas are expressed or embodied in the philosophy of Kant in Germany , Voltaire and Diclesot in France, lake and Hume in Britain 
            In Britain 
          Lyotard
  The term 'postmodernism'  was used in the 1930s. but its current sense and vogue can be said to have begun with Jean.  Francois Lyotard's The postmodern condition:  A Report of knowledge.  Lyotard's essay 'answering the Question:  What is Postmodernism'?, first published in 1982, added in 1984 as an appendix to The Post Modern Condition and included a Brooker's Modernism/Postmodernism, 1992, takes up this debate about the enlightenment, mainly targeting Habermas, in a slightly oblique manner.  Lyotard opens with a move which effectively turns the debate into a struggle to demonstrate that one's opponents are the real conservatives (a familiar 'bottom line' of polemical writing on culture).  'From every direction', he says, 'we are being urged to put an end to experimentation', and after citing several other instances he writes (obviously of Habermas):
            I have read a tinker of repute who detends modernity against those who he calls the neo-conservatives.  Under the banner of post-modernism, the latter would like, he believes, to get rid of the uncompleted project of modernism, that of the Enlightenment. 
            Habermar's is simply one voice in a chorus which is calling for an end to 'artistic experimentation' and for 'order....unity, for identity, for security'  In a word, there voices want 'to liquidate the heritage of the avant-gardes'. For Lyotard the Enlightenment whose project Habermas wishes to continue is simply one of the would-be authoritative 'overarching', 'totalising' explanations of things - like Christianity, Marxism, or the myth of scientific progress.  These 'Metanarratives' ('Super-narratives), which purport to explain and reassure, are really illusions, fostered in order to smother difference, opposition, and plurality.  Hence Lyotard's famous, definition of postmodernism, that it is, simply, 'incredulity towards meta narratives'.  'Grand Narratives' of progress and human perfectibility, then, are no longer tenable, and the best we can hope for is a series of 'mini narratives', which are provisional, contingent, temporary, and relative and which provide a basis for the actions of specific groups in particular local circumstances.  Post modernity thus 'deconstructs' the basic aim of the Enlightenment, that is 'the idea of a unitary end of history and of a subject.
     Baudrillard       
Another major theorist of postmodernism is the contemporary French writer Jean Baudrillard, whose book simulations (1981) marks his entry into this field.  Baudrillard is associated with what is usually known as 'the loss of the real', which is the view that in contemporary life the pervasive influence of images from film, TV, and advertising has led to a loss of the distinction between real and imagined, reality and illusion, surface and depth.  The result is a culture of 'hyper reality', in which distinctions between there are eroded.  His propositions are worked out in his essay 'Simulacra and Simulations reprinted in abridged form in Brooker, 1992.  He begins by evoking a past era of 'fullness', when a sign was a surface indication of an underlying reality, but merely of other signs?  Then the whole system becomes what he calls a Simulacrum.  He then substitutes for representation the notion of simulation.  The sign reaches its present stage of emptiness in a series of steps, which will try to illustrate by comparing them to different kinds of paintings.
            First the sign represents a basic reality:  Let's take as an example of this representations of the industrial city of Salford 
            The second stage for the sign is that it misrepresents or distorts the reality behind it.  As an example of this let's take the glamourised representations of cities like Liverpool and Hull 
            The third stage for the sign is when the sign disguises the fact that there is no corresponding reality underneath.  To illustrate this, take a device used in the work of the surrealist artist Rene Magritte, where, in the painting, an easel with a painter's canvas on it is shown standing alongside a window: on the canvas in the painting is painted the exterior scene which we can see through the window.  But what is shown beyond the window is not reality, against which the paint within the painting can be judged, but simply another sign, another depiction, which has no more authority or reality than the painting within the painting (which is actually a representation of a representation). 
