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Anisotropic expansion of Quark-Gluon Plasma fireballs created in heavy ion collisions at high energies is studied using relativistic hydrodynamic simulations. I quantify the asymmetry using Fourier coefficients in order to inspect the relation between deformations of the initial energy distribution and anisotropies of the finally measured momentum distributions. The Relativistic Heavy Ion Collider provides a wealth of data for theorists to explain. This information is about emitted particles, so collision dynamics must be inferred. RHIC collisions are so energetic that atoms melt into a plasma of quarks and gluons which flows like an ideal fluid[1], surrounded by hadron gas, with a mixed-phase region in between[2]. Computer simulations predic