diff --git a/artist/gradient.go b/artist/gradient.go
index 2a7a16d..c89ff29 100644
--- a/artist/gradient.go
+++ b/artist/gradient.go
@@ -14,14 +14,14 @@ func (pattern Gradient) AtWhen (x, y, width, height int) (c color.RGBA) {
 	var position float64
 	switch pattern.Orientation {
 	case OrientationVertical:
-		position = float64(x) / float64(width)
+		position = float64(y) / float64(height)
 	case OrientationDiagonalRight:
-		position = (float64(x) / float64(width) +
+		position = (float64(width - x) / float64(width) +
 			float64(y) / float64(height)) / 2
 	case OrientationHorizontal:
-		position = float64(y) / float64(height)
+		position = float64(x) / float64(width)
 	case OrientationDiagonalLeft:
-		position = (float64(width - x) / float64(width) +
+		position = (float64(x) / float64(width) +
 			float64(y) / float64(height)) / 2
 	}
 
diff --git a/elements/testing/artist.go b/elements/testing/artist.go
index 3533b5e..f319ab7 100644
--- a/elements/testing/artist.go
+++ b/elements/testing/artist.go
@@ -207,7 +207,11 @@ func (element *Artist) Resize (width, height int) {
 	artist.FillEllipse (
 		element,
 		artist.EllipticallyBordered {
-			Fill: uhex(0xFF0000FF),
+			Fill: artist.Gradient {
+				First:  artist.NewUniform(hex(0x00FF00FF)),
+				Second: artist.NewUniform(hex(0x0000FFFF)),
+				Orientation: artist.OrientationVertical,
+			},
 			Stroke: artist.Stroke { Pattern: uhex(0x00FF00), Weight: 5 },
 		},
 		element.cellAt(0, 7))