We describe a system for taking a 2D sketch of a mirror-symmetric 3D shape and lifting the
curves to 3D, inferring the symmetry relationship from the original hand-drawn curves. The
system takes as input a hand-drawn sketch and generates a set of 3D curves such that their
orthogonal projection matches the input sketch. The main contribution is a method which is
able to identify the symmetry relationship among the hand-drawn curves even in the
presence of ambiguity in the sketch.