Why do we not like Hybridization?
Negative Connotation;
Centaur portrays epitome of the hybrid, portrayed as Monster, why?
It incarnates the mix, the elusive, the heterogeneous, in a word, the hybrid! Inextricably linked to the hybrid is the notion of unpredictability: while you may know how a horse or a human being reacts, you don't know how the centaur will behave, and its unpredictability gives it a sort of mystery, and therefore power, that can be frightening.