‘Secretive Three Graces,’ 2008, by Debbie Han, and an Eero Saarinen-designed table from Knoll define the study. A Gino Sarfatti light fixture from Flos, part of the owners’ collection, suspends in the room, which Hollis painted with Pitch Black by Farrow & Ball. ‘Artificial Rock #146,’ 2011, by Zhan Wang, stands just outside the space.