Kusama first used mirrors in the mid-1960s in her large-scale installations . Kusama has underlined the importance of the role the viewer plays in her rooms and how he or she continually experiences the work in a new way : ‘ One is more aware than before that he himself [ the viewer ] is establishing relationships as he apprehends the object from various positions and under varying conditions of light and spatial context … For it is the viewer who changes the shape constantly by his change in position relative to the work .’