A vintage-style illustrated blueprint spread across a drafting table, showing an intricate maze of pneumatic tubes, brass pipes, and mechanical sorting mechanisms connecting two distinct Victorian-era buildings through a cloud of copper gears and steam. Small colored envelopes travel through the transparent tubes, some diverting through a central ornate filtering station with spinning cogs and gauges. The scene is rendered in sepia tones with touches of deep blue and copper, featuring architectural cross-sections, compass roses, and technical measurement marks along the edges. Scattered around the blueprint are antique drafting tools, a brass magnifying glass, and rolled parchment maps with route markings.