apartments at Edgecliff (1965-6). Only four significant small projects were undertaken between 1962 and 1969: a ski lodge in Thredbo (1962), a holiday house in Port Hacking (1963), the Seidler's own home (1966-7) and the memorial to victims of the Holocaust, at Rookwood Cemetery (1969). In the mid-1960s Seidler began experimenting with circular, elliptical and curvilinear geometrics. The choice of a circular plan for the ground breaking Australia Square Building 1963-7 marked an important departure from the established rectilinear order of Seidler's earlier work [Philip Drew]. In the 1970s Seidler's practice was largely devoted to major commercial projects in Australia and abroad. This period saw the design and construction of Seidler's own offices at Glen Street, Milsons Point, Sydney; the MLC Centre in Sydney (1972); the Edmund Barton Building, Canberra; the Australian Embassy in Paris; and commissions in Singapore (not realised) and Hong Kong. The 1980s saw the construction of major commercial buildings such as Grosvenor Place in Sydney (1988); the Waverley Civic Centre (now called Monash City Council) at Waverley in Victoria (1982); Capita Centre in Sydney (1984); Shell Headquarters in Melbourne (1985); the QV1 Office Tower in Perth (1987) and the Riverside Centre in Brisbane (1987). In 1990s Harry Seidler and Associates designed celebrated and iconic residences and apartments such as Berman House at Joadja in the Southern Highlands (1996) and Horizon Apartments in Darlinghurst (1999). The new century was notable for works such as the Cove Apartments at the Rocks (2004) and the Ian Thorpe Aquatic Centre at Ultimo. Internationally Seidler is known for the Australian Embassy in Paris, the Hong Kong Club and Offices, a community for 2,500 people in Vienna, as well as buildings in Acapulco. Harry and Penelope Seidler House After more than twenty five years designing houses for other people, Seidler and his wife Penelope determined to design a house for their own family. The site selected after much searching was located by Penelope Seidler in Killara, an established suburb of Sydney. Surrounded by a natural bush reserve, the site's rocky sandstone ledges slope steeply down toward a creek and a waterfall. The rugged sloped land was turned to advantage by providing the rationale for a vertical dimension to the design. The Seidlers described their house as "essentially a simple rectangular outline." The four half-storey levels of the house follow the slope of the land and create between them open vertical spaces which