Robert realized the creative possibilities of making variations on the same work. With the matching paintings, Window (Day) and Window (Night), Robert has not changed the composition, only the light and colour. When seen together, the pair of paintings create a cinematic effect or the effect of a time lapse photograph. This reinforces the theme of time. The dark background sets off the glowing but shadowed face of the clock. Waiting to be released from hospital, waiting to be released from life, the window ledge is symbolic of a threshold, transitioning from one life condition to another.