The new Visitor Centre is intended to re-establish the site as part of Toronto’s identity and as a cultural touchstone for Canada. The delicacy of Fort York as a defensive site produces an architecture that is mostly about lines. Existing lines such as the lines of Fort walls and the lines of sharpened logs ("frise" -- a defense of pointed stakes projecting from the ramparts in a horizontal or an inclined position) are our source of new lines - lines of weathering steel walls, lines of docks and bridges, lines of light. The grassed defensive moat in front of the Fort and the surprisingly low berm rampart are both quiet and subtle. These earthworks are experienced from Garrison Common, the battlefield which fronts them, as a liquid rolling of the land, a delicate move but one with severe consequences. Lines and Liquid Landscapes suggest the architecture of our project. We redefine the lost south boundary of the Common with a new escarpment of weathering steel. As this wall is not the original line of the defensive landscape, its materiality is decidedly new. It is a major new infrastructural and landscape-scaled dashed line: an extended wall capable of joining with the scale of the elevated Gardiner above to form a great new urban space for Toronto.