The postage stamp marking the 150th anniversary of the Universal Postal Union features a vintage yellow bicycle as a central motif, with a postal worker dressed in traditional attire riding it. Accompanying the bike is a carrier pigeon, symbolizing historic communication, and a world map in the background illustrating the global reach of the Union. The design uses Dark Blue (CMYK 1/99/1/0) for prominent elements, Light Green (CMYK 50/0/0/0) for the background, and Pale Yellow (CMYK 51/51/0/0) for additional highlights. The highlight colors are applied with a "multiply" blending mode and adjusted opacity to add depth and visual richness to the design.