The PHC Software headquarters building is located at Taguspark, a technology office park, in Oeiras Valley, close to Lisbon. With an area of 4,000m2, the building's facade reveals two distinct layers that explore the balance between the opaque and the transparent. The concrete shell that envelops the inner glass volume adds dynamism to the overall edifice and highlights the connection between the interior and the exterior. The permeability and curvilinear language of the shell accentuate the play of light and shadow of the building's architectural design and mark its surroundings.