A vintage 1960s-style technical illustration showing a winding pneumatic tube system inside a massive corporate machine, with small capsules containing documents traveling through transparent tubes that branch and escalate upward through three distinct levels of increasingly complex mechanical chambers, each chamber more intricate than the last with gears, valves, and indicator dials, the bottom level broad and busy with many intake ports, the middle level featuring sorting mechanisms and analysis instruments, the top level intimate with precision tools and a single focused workstation, warm sepia and muted blue tones, cross-section view like a vintage cutaway diagram, hand-drawn hatching and mechanical drafting aesthetic