As the artist Ignasi Monreal gazes at the sky and the rooftops of Madrid from the golden dome that is his home, he shares some words of warning: “Nothing here is practical or comfortable. Neither the cost nor the maintenance is worth it,” says Barcelona-born Monreal. Architect and designer Guillermo Santomà, with whom Monreal developed the home’s interior design says. This home is an experiment that brought us together.” The pair didn’t start out with a defined plan for how they would renovate the 947-square-foot home.