Pigeon
The pigeon has served as religious symbol, military asset, and scientific subject across virtually every major human civilisation. Mesopotamian temples kept sacred dove populations. Roman generals deployed messenger pigeons in military campaigns. Darwin's studies of pigeon breeding informed the foundational theories of evolution. In modern context, pigeons appear in works by Banksy, feature prominently in Trafalgar Square tourism, and have inspired scientific research yielding three Nobel Prizes in studies of magnetoreception and learning behaviour.
Harry Potter
The Harry Potter franchise has generated approximately $9 billion in book sales alone, with film adaptations, theme parks, and merchandise pushing total economic impact beyond $25 billion. The series has been translated into 80 languages and sold to readers in over 200 territories. Cultural penetration includes academic courses, psychological studies, and the permanent alteration of children's literature publishing practices. Platform 9 3/4 at King's Cross Station now requires queue management systems during peak tourist seasons.
VERDICT
Whilst the pigeon's cultural contributions span millennia of human history, Mr Potter's concentrated economic and social impact within a mere three decades represents cultural saturation of unprecedented density. The wizard takes this category by commercial margins.