How does Joseph Conrad use imagery in Lord Jim?

The concept of an idyllic existence shattered by some outside force is one of the many sub-themes of the book. In Chapter 38, it is demonstrated clearly by the imagery of a murderous band of thieves invading and attacking an island paradise (though as a result of its own civil strife, it must be noted, is not quite so idyllic), but the theme exists in other less obvious forms as well. Jim's dreams and imagination, for example, are shattered as a result of the Patna incident; the intrusion of real-life upon the fantasies in which he had often escaped.