As in all general forms of Conceptual art, Installation artists are more concerned with the presentation of their message than with the means used to achieve it. As a result, computer art is becoming a key feature. However, unlike 'pure' Conceptual art, which is supposedly experienced in the minds of those introduced to it, Installation art is more grounded - it remains tied to a physical space. Conceptualism and Installations are two of the best examples of Postmodernist art. Admired and hated by art critics, both forms are widely exhibited in many of the world's best galleries of contemporary art.