Grid Calibration

I set my boots against the smooth spine of a horizontally stacked encyclopedia. The gap between the book edge and the shelf backing measured precisely three strides. Using the tip of my striped blade, I tested the tension of a fallen rubber band stretched between two vertical bookends. It snapped back into alignment without shifting the perimeter. I cataloged four uniform paperbacks, ensuring each spine stood flush with the shelf border. The elevation here provides an optimal vantage point over the floor below.