It is hard to think of any architect in our time that has addressed the essence of architecture with a greater intellectual approach than Peter Eisenman. Whereas architecture is often about forms, his is about ideas, about challenging fundamental questions such as the role of architecture in our society and the very meaning of the built form. His Memorial for the Murdered Jews in the center of Berlin, surrounded by the Reischtag and other iconic buildings is one of the most moving commissions of recent years. The abstraction, the silence, the lack of imagery area echoed by the rectangular concrete blocks manifest the story of the Jewish nation. You cannot represent it, he says.