Arnhem Centraal is a seamless response using horizontal layers and vertical trajectories that weave into one monumental cross-stitching. Structure is flow. In a free almost biological sense, far removed from the constraints of traditional form-making, layering and folding take over and the concerns of a Newtonian mechanics fall away. Using a loop in space, ranging in width, a flow of other vertical loops begin to form a single trace, becoming the structural diagram for this mixed development project of offices, railway station hall and basement car park. The trace leaps across the station hall area and folds into curved surfaces before straightening out again into the horizontals of the office floors. This weave transforms to a tectonic form, merging on plan and climbing into a vertical warp.