This 20-cent commemorative stamp from Christmas Island (Indian Ocean) pays tribute to Sir Rowland Hill (1795–1879), the British postal reformer renowned for introducing the world’s first postage stamp, the Penny Black. The design cleverly incorporates a miniature reproduction of a 4-cent Christmas Island stamp featuring the Balistes vidua (Crosshatch Triggerfish), originally part of the island’s marine life definitive series illustrated by George Hamori. The juxtaposition symbolizes the evolution of postal history — from Hill’s revolutionary reforms to the diverse modern issues of far-flung territories like Christmas Island.