The evolution of the system created in a high energy nuclear collision is
very sensitive to the fluctuations in the initial geometry of the system. In
this letter we show how one can utilize these large fluctuations to select
events corresponding to a specific initial shape. Such an "event shape
engineering" opens many new possibilities in quantitative test of the theory of
high energy nuclear collisions and understanding the properties of high density
hot QCD matter.Comment: 6 pages, 5 figure