With Giacomo Lepri Berluti and Daniele Marinangeli . Facade graphics : Giacomo Lepri Berluti.Structural Engineers: studio Paolinelli - Ciarloni.A cantilevering volume wrapped in a spectacular facade will define an outstanding building whose character will represent a new peculiarity in Sofia's Architectural panorama. The Volume will follow compositive logics typical of rocks or canyons and will abstract them. A big volume with gently inclined facades, an internal layout that will emphasize the overlook from one area to another and the large use of double volume spaces will give the Collider Center users an Adventurous and risky feeling which we believe perfectly fits Walltopia philosophy. The Graphics on the facade Fabric will define a Unique building with a distinctive and energic nature.The internal layout will be determined by 2 main Canyons one from East to West where climbing and boulder hall are placed and another that will run from North to South, linking the boulder hall with the Funtopia. The Cafe' is placed as a node of the public areas being able to have visual connections to entrance, Funtopia, Climbing hall ( at mezzanine level ), Greenhouse with Polyethylene removable roof will define the border between the building ant the park.The park will define a perfect space for outdoor activities, everything in its definition will communicate a feeling of action and movement, starting from the alley in sinthetic material typical of athletic fields to the climbing wall attached to the facade and the various design boulders; boulders and trees will be placed following an organic scheme randomly placed as if they were real mushrooms growing where they want.