The building EDP (Energies of Portugal) in Porto (Portugal) was built in 2011, with the architectural design of authoring Ginestal Machado and Patricia Lamego. In this new construction, I highlight the stairs that connect the auditorium located on the underground level with the outside. In this series "stair variations", I try to show various forms of photographic approach these stairs, highlighting its beauty and aesthetic harmony. Stairs that lead us from an underground world to the daylight.