ABOVE: Working with artists and sculptors has always been an essential part of the design DNA of Firmdale, the hotel group that Kit Kemp founded in the 1980s with her husband Tim. At New York City’s Warren Street Hotel, a chandelier by serial collaborator Gareth Devonald Smith hangs in the reception area, and the vibrant blue of the new building’s distinctive powder-coated windows is continued inside OPPOSITE: Kit Kemp in her London studio