Situated on a hilltop in the Hudson Valley, the Cat Hill House adapts to its surroundings with a gravity-defying design. The main living spaces of the dwelling are housed in a rectilinear volume planted on level ground. Floor-to-ceiling glazing at the rear of the home opens the interior to views of the Catskill Mountain, as well as the creek below. A narrow section branches off from the primary structure and expands over the sloping terrain. The extension houses a gallery that leads to a fitness studio. Designed for a marathon runner, the glass-enclosed room floats in the trees and provides an inspiring retreat to train in nature.