“Not long ago I stood with a friend next to an art work made of four wood beams laid in a long rectangle, with a mirror set behind each corner so as to reflect the others. My friend, a conceptual artist, and I talked about the minimalist basis of such work: its reception by critics then, its elaboration by artists later, its significance to practitioners today, all of which are concerns of this book as well. Taken by our talk, we hardly noticed his little girl as she played on the beams. But then, signaled by her mother, we looked up to see her pass through the looking glass. Into the hall of mirrors, the mise-en-abîme of beams, she moved farther and farther from us, and as she passed into the distance, she passed into the past as well.

Yet suddenly there she was right behind us: all she had done was skip along the beams around the room. And there we were, a critic and an artist informed in contemporary art, taken to school by a six-year-old, our theory no match for her practice. For her playing of the piece conveyed not only specific concerns of minimalist work - the tensions among the spaces we feel, the images we see, and the forms we know - but also general shifts in art over the last three decades - new interventions into space, different construction of viewing, and expanded definitions of art. Her performance became allegorical as well, for she described a paradoxical figure in space, a recession that is also a return, that evoked for me the paradoxical figure in time described by the avant-garde. For even as the avant-garde recedes into the past, it also returns from the future, repositioned by innovative art in the present. This strange temporality, lost in stories of twentieth-century art, is a principal subject of this book.”