In this environment the Collider Activity Center has an important urban role to play as a catalyst in the growth of its immediate urban context. The design makes use of a dynamic geometry, a self-similar fractal pattern that is infinitely variable within a simple set of rules. The form of the two pavilions appear in motion, in the process of slowly sliding towards an inevitable collision with one another. As they come together the landscape cracks and warps creating a varied terrain of surfaces that reflects the language of geological formations. The form is folded to make space for the functions it contains, and cut open to allow south light to penetrate the building and expose views to the surrounding landscape and Mount Vitosha.