void DrawBuildEffect (Cairo.Context context, Gdk.Rectangle area, float progress)
		{
			CairoExtensions.RoundedRectangle (context, area.X + .5, area.Y + .5, area.Width - 1, area.Height - 1, 3);
			context.Clip ();

			Gdk.Point center = new Gdk.Point (area.Right - 100, area.Bottom - 10);
			context.Translate (center.X, center.Y);
			var circles = new List<Tuple<int, int, int, double>> {
				new Tuple<int, int, int, double> (25,  15, 1, Math.PI * 1.5),
				new Tuple<int, int, int, double> (30,  9,  2, Math.PI * 1.5),
				new Tuple<int, int, int, double> (45,  15, 3, Math.PI * .5),
				new Tuple<int, int, int, double> (60,  6,  1, Math.PI * 1.75),
				new Tuple<int, int, int, double> (75,  15, 2, Math.PI * .75),
				new Tuple<int, int, int, double> (90,  5,  2, Math.PI * 1),
				new Tuple<int, int, int, double> (100, 25, 1, Math.PI * 1.5),
				new Tuple<int, int, int, double> (120, 35, 3, Math.PI * .5),
			};

			foreach (var arc in circles) {
				context.Rotate (Math.PI * 2 * progress * arc.Item3);
				context.MoveTo (arc.Item1, 0);
				context.Arc (0, 0, arc.Item1, 0, arc.Item4);
				context.LineWidth = arc.Item2;
				context.Color = new Color (0, 0, 0, 0.05);
				context.Stroke ();
				context.Rotate (Math.PI * 2 * -progress * arc.Item3);

				progress = -progress;
			}

			context.LineWidth = 1;
			context.ResetClip ();
		}