The postage stamp rectangulaire commemorating the 150th anniversary of the Universal Postal Union features a richly detailed scene of a postal worker on a vintage yellow bicycle. The bicycle is adorned with leather saddlebags designed to carry letters, symbolizing the historical role of mail delivery. Accompanying the worker is a carrier pigeon in flight, representing the evolution of postal communication. The background showcases a world map to highlight the Union's global impact. The design utilizes Dark Blue (CMYK 1/99/1/0) for key elements, Light Green (CMYK 50/0/0/0) for the background, and Pale Yellow (CMYK 51/51/0/0) for accent details. Highlight colors are applied with a "multiply" blending mode and adjusted opacity to add depth and enhance visual appeal.