A concert hall designed for 150 inside the house, where the likes of composer Philip Glass have performed.
Courtesy Philip Castleton
Intimate spaces punctuate the house, rooms within rooms.
Courtesy Philip Castleton
"I think it's one of the most important private houses built in North America in a long time," says Glenn D. Lowry, director of New York's Museum of Modern Art.
Courtesy Philip Castleton
The galley-style kitchen.
Courtesy Philip Castleton
A sense of discovery hums through the house.
Courtesy Philip Castleton
A master bedroom in the treetops, overlooking a ravine.
Courtesy Philip Castleton
Everything was done to the precise specifications of James Stewart, a millionaire mathematician.
Courtesy Philip Castleton
The architectural marvel includes an elegant pool, on the lower level, in a room in which the windows can be made to disappear to allow for open-air swimming.
Courtesy Undine ProÃÂhl
The house was christened 'Integral House," a reference to the mathematical integral symbol, commonly used in calculus.
Courtesy Philip Castleton
