A weekend house on a wooded hilltop for a childless professional couple.  The only rooms with doors are guest-bedrooms and bathrooms.  The rest is programmatically modulated, multi-level open space.  To take advantage of views, the house is as tall as the zonning allowed.  To avoid long flights of stairs, the height of the house is split into 7 levels with never more than 5 steps in-between them.  There are no landings and no corridors.