A vintage 1960s style illustration of a pneumatic tube system inside a retro office building, with a brass cylindrical capsule mid-flight through transparent glass tubes that wind and curve through the scene. The capsule glows with a warm amber light from within, suggesting important contents. The tubes connect various ornate brass terminals with art deco styling. Muted teal, copper, and cream color palette with subtle paper texture overlay. The perspective follows the tube system from a dramatic low angle, emphasizing the journey of the message through the mechanical delivery network. Warm tungsten lighting casts soft shadows, creating depth and nostalgia.