The ideas of Sauer, Darby, Clark, and Meinig have had a formative influence on the making of modern Anglo-American historical geography. These scholars emphasized the spatial- and place-focused orientation of geography, contrasting it with history's concern with time, the past, and change. Historical geography was conceived as combining the spatial interests of geography with the temporal interest of history, creating a field concerned with changing spatial patterns and landscapes. This idea of historical geography avoided issues in the philosophy of history by making the historical geographer a kind of spectator to external changes in the ways things were ordered and arranged on the face of the earth. This "natural history" view of historical geography failed to deal with history conceived as an autonomous mode of understanding in which the scholar's task is to understand human activity as an embodiment of thought. Historical geography is more adequately conceived as a Collingwoodian-type historical discipline, in which the task of the historical geographer is aimed at rethinking and displaying the thought of historical agents as their actions relate to the physical environment. The traditional subject matter of historical geography is not thereby redefined, but a change in the way geography is seen in its relation to history is necessitated.