In his work, he repeatedly found solutions to recurring problems, and discovered the pattern form in the process. Martin Fowler easily could have written a book on object-oriented analysis. Instead we have a book cataloging the result of analysis. The domains addressed vary from medical record keeping to financial derivative trading, with several stops in between. Amazingly, they all do.
Martin places each problem in a context, then offers a solution for that context.
You will see familiar aspects in every context. You will recognize the problems. You will appreciate the results. Finally, Martin writes in a personal style, relaying his thoughts and judgments. We feel his respect for his clients and colleagues, from whom, he admits, most insights arise.