We propose compactness to built up an essential, pure, geometric and recognizable -a triangle-, iconic urban piece, able to evoke  formal essences, and to generate intense relationships between inside and outside. The program arises from a radical premise: to divide the volume in levels according to uses in a versatile scheme. The exhibition spaces are totally in an underground level so the volume does not exceed 15 meters, opposite to the 24 meters  neighboring buildings. The ground floor is a free scheme, transparent and permeable. The upper floor contains spaces for events and conferences, and the terrace is a large garden overlooking the Tiergarten It becomes a place where outdoor exhibitions, educational science experiments, energy collection or parties and concerts take place. All is connected with a great void that can hold the exhibition of artifacts or objects of great dimension.