On June 29, 2007, in Washington, DC, the Postal Service issued the 41-cent Pollination commemorative stamps in four designs in a pressure-sensitive adhesive (PSA) double-sided booklet of twenty stamps. Steve Buchanan of Winsted, Connecticut, designed the stamps. 700 million stamps were produced.
Buchanan created an intricate graphic scheme that emphasizes the ecological relationship between pollinators and plants and also hints at the biodiversity necessary to ensure the future viability of that relationship. To that end, the four different stamp designs are arranged in two alternate blocks that fit together like interlocking puzzles. In one block, the pollinators form a central starburst; in the other block, the flowers are arranged in the center.
Postal Bulletin (May 24, 2007).