Art conceptuel et language

Joseph Kosuth, One and Three Chairs, 1965

Sol Lewitt, WORK FROM INSTRUCTIONS (1971):
USING A BLACK, HARD CRAYON DRAW A TWENTY INCH SQUARE.
DIVIDE THIS SQUARE INTO ONE INCH SQUARES. WITHIN EACH
ONE INCH SQUARE, DRAW NOTHING, OR DRAW A DIAGONAL
STRAIGHT LINE FROM CORNER TO CORNER OR TWO CROSSING
STRAIGHT LINES DIAGONALLY FROM CORNER TO CORNER.