An architecture is often thought of as one uniform thing that underlies an enterprise. However, if an enterprise itself is not uniform, is it reasonable to think of its underpinnings as being consistent everywhere? Would we not expect an ideal architecture to mold itself around the curves and ragged edges of the real outlines of the enterprise, guiding it, and being guided by it? This Advisor suggests a three-dimensional framework intended to help in grasping the critical spatial dimensions of enterprises, and to assist in seeing the lines and jagged edges of a specific enterprise, along those dimensions. Architecture needs a ground to stand on – that ground is the enterprise architecture. It behooves architects to grasp what lies beneath their feet.