context: The central garden was redesigned by Kim Wilkie and opened as the John Madejski Garden, on 5 July 2005. The design is a subtle blend of the traditional and modern, the layout is formal; there is an elliptical water feature lined in stone with steps around the edge which may be drained to use the area for receptions, gatherings or exhibition purposes. This is in front of the bronze doors leading to the refreshment rooms, a central path flanked by lawns leads to the sculpture gallery; the north, east and west sides have herbaceous borders along the museum walls with paths in front which continues along the south façade; in the two corners by the north façade there is planted an American Sweetgum tree; the southern, eastern and western edges of the lawns have glass planters which contain orange and lemon trees in summer, these are replaced by bay trees in winter.
question: What is behind the water feature?