In this sophisticated example of architectural interventionism, bedrooms created as elevated glass cases have been inserted into the shell of a New York apartment to produce spaces with a delicate and ethereal quality. Both imaginative power and clarity of thought have been brought to the project; the apartment has been transformed by the well-executed realisation of strong ideas and the disciplined distillation of the programme. Also evident is the strength of the collaboration of the Architects, who exhibit a refined understanding of materials and materiality, with local craftspeople.