“Big Roof ” is an oversized garden pergola nicknamed after it’s most prominent feature — a big roof designed for dining and events at Coriander Kitchen & Farm. Big Roof extends the dining space into the outdoors, creating an open relationship between structure and site. In the winter, the structure acts as a lantern, illuminating the surrounding landscape. In the spring, the plastic facade is removed and activities spill out to the canalside. Triangular trusses are built of nominal lumber, opening up views of the constantly changing canal skies above.