The piece becomes the protection of the building and also a gathering place. Therefore dialogues in the relation between public and private. People will walk rapidly by the square and see the piece only at a glance, but sometimes they will be attracted to it and stay for longer periods of time, gathering around it. And waiting to see the different rhythms and changes in the sequence of water.
The openings on the under ground and the reflection on the edges gives a continuity of the whole under the building.
As if the phreati clayers that flow through the earth were designed to make the wáter appear and disappear.