Gemini, the sign of the twins, represents duality. Giminis will take either side of an argument, not because they feel strongly about their position, but simply for the fun of it. They are adaptable and flexible, and require numerous amusements and interests at once to satisfy their quick, changeable minds. Ruled by Mercury, the hallmark of Gemini is self-expression. To the world they are cheerful and optimistic, but those who are close to a Gemini are familiar with the opposite, moody side of this sign, too. A Gemini will shower you with generosity, refill your glass, and toast to life!