The singularity of this project begins with its location at the Public Maternity and Pediatric Hospital Gregorio Maranón in Madrid, carried out by the architect Rafael Moneo in collaboration with José Mª de la Mata in 2003. This project was a motivational initiative by the Juegaterapia Foundation which produced and submitted a successful proposal to occupy the roof of the O'Donnell Maternity Hospital and begin its transformation into a playground so that hospitalized children can play outdoors. This colorful and unexpected space aims to improve the day-to-day life of children and their families, with the intention of facilitating mutual encounters and accelerating their recovery.

The glazed envelope of the hospital, neutral and calm, constitutes the backdrop of the colorful and unexpected proposal. On the horizontal and organized roof, the multi-colored spots order the exterior spaces of the garden in a vivid way and strongly contrast with the original building.The curvilinear white concrete figures, of different heights and dimensions, protect from the sun as well as reflect the colors and textures, producing attractive and vibrant spaces sheltered under them. 

They are called "the clouds" of the garden. Supported by slender circular supports, the image is perceived with a certain weightlessness. On the lower face, different elements are found such as glass, perforations or ceramic mosaics providing rich nuances to the general view. Beneath them, the coloured spots on the pavement contain the activities and games, which remain more or less visible behind the curved walls, thus inviting children to explore and discover the garden.

The large area of the garden is divided into two zones of different characters depending on the street they accompany. From the entrance,access the first of them, more noisy and located next to O'Donnell Street, which has a small stage, as well as swings, slides, kicycles, and a maze. Something further away, a space dedicated for teenagers where they can sit next to a ping-pong table and a small soccer goal.

The second area, which is calmer, elongated and overlooking the further park, has a large irregular table with two heights, a telescope, table football, tangram, baskets and a small mini-golf at the end of the course. Connecting both spaces, we find the hall of mirrors, a room with the intention of creating surprise while introducing a new experience and making the passage between areas more pleasant.

The perimeter is formed by a semi-transparent mesh enclosure that encompasses the garden while allows long views over the characteristic landscape of Madrid.Padilla Nicás Arquitectos would like to think that the result is perceived as abstract and dreamlike, intentionally alien to other known spaces and with the ability for each child to project their imagination and fantasy onto it, finding their own space for play and fun outdoors away from [their] daily routine at the hospital.