The slope was too steep for ordinary blocks, so the building follows it: every floor steps back from the one beneath, and every roof becomes a garden for the neighbours above.

The concrete is left raw and cast against narrow boards. In the humid climate it darkens with rain and lightens in the sun, so the facade changes through the day.

Stairs and walkways are open to the air. They work as streets, with benches and planting, and the residents use them to meet, not only to pass.