How does John Osborne use imagery in Look Back in Anger?

Two sound images from off-stage are used very effectively in Look Back in Anger: the church bells and Jimmy's jazz trumpet. The church bells invade the small living space and serve as a reminder of the power of the established church, and also that it doesn't care at all for their domestic peace. The jazz trumpet allows Jimmy's presence to dominate the stage even when he is not there, and it also serves as his anti-Establishment "raspberry."