diff --git a/src/Perspex.SceneGraph/IVisual.cs b/src/Perspex.SceneGraph/IVisual.cs
index 559ac21745..76ab95e6e6 100644
--- a/src/Perspex.SceneGraph/IVisual.cs
+++ b/src/Perspex.SceneGraph/IVisual.cs
@@ -58,7 +58,7 @@ namespace Perspex
         /// <summary>
         /// Gets or sets the transform origin of the scene graph node.
         /// </summary>
-        Origin TransformOrigin { get; set; }
+        RelativePoint TransformOrigin { get; set; }
 
         /// <summary>
         /// Gets the scene graph node's child nodes.
diff --git a/src/Perspex.SceneGraph/Perspex.SceneGraph.csproj b/src/Perspex.SceneGraph/Perspex.SceneGraph.csproj
index 8841e9a7de..660cbe38d7 100644
--- a/src/Perspex.SceneGraph/Perspex.SceneGraph.csproj
+++ b/src/Perspex.SceneGraph/Perspex.SceneGraph.csproj
@@ -98,7 +98,7 @@
     <Compile Include="Media\Transform.cs" />
     <Compile Include="Media\TileBrush.cs" />
     <Compile Include="Media\VisualBrush.cs" />
-    <Compile Include="Origin.cs" />
+    <Compile Include="RelativePoint.cs" />
     <Compile Include="Platform\IFormattedTextImpl.cs" />
     <Compile Include="Platform\IBitmapImpl.cs" />
     <Compile Include="Platform\IGeometryImpl.cs" />
diff --git a/src/Perspex.SceneGraph/Origin.cs b/src/Perspex.SceneGraph/RelativePoint.cs
similarity index 52%
rename from src/Perspex.SceneGraph/Origin.cs
rename to src/Perspex.SceneGraph/RelativePoint.cs
index 591a2379eb..a0f368bdf2 100644
--- a/src/Perspex.SceneGraph/Origin.cs
+++ b/src/Perspex.SceneGraph/RelativePoint.cs
@@ -4,12 +4,13 @@
 namespace Perspex
 {
     /// <summary>
-    /// Defines the reference point units of an <see cref="Origin"/>.
+    /// Defines the reference point units of an <see cref="RelativePoint"/> or 
+    /// <see cref="RelativeRect"/>.
     /// </summary>
-    public enum OriginUnit
+    public enum RelativeUnit
     {
         /// <summary>
-        /// The origin's point is a percentage.
+        /// The point is expressed as a percentage of the containing element's size.
         /// </summary>
         Percent,
 
@@ -20,59 +21,59 @@ namespace Perspex
     }
 
     /// <summary>
-    /// Defines an origin for a <see cref="Perspex.Media.Transform"/>.
+    /// Defines a point that may be defined relative to a containing element.
     /// </summary>
-    public struct Origin
+    public struct RelativePoint
     {
         /// <summary>
-        /// The default origin, which is the center of the control.
+        /// A point at the center of the containing element.
         /// </summary>
-        public static readonly Origin Default = new Origin(0.5, 0.5, OriginUnit.Percent);
+        public static readonly RelativePoint Center = new RelativePoint(0.5, 0.5, RelativeUnit.Percent);
 
         private Point _point;
 
-        private readonly OriginUnit _unit;
+        private readonly RelativeUnit _unit;
 
         /// <summary>
-        /// Initializes a new instance of the <see cref="Origin"/> struct.
+        /// Initializes a new instance of the <see cref="RelativePoint"/> struct.
         /// </summary>
         /// <param name="x">The X point.</param>
         /// <param name="y">The Y point</param>
-        /// <param name="unit">The origin unit.</param>
-        public Origin(double x, double y, OriginUnit unit)
+        /// <param name="unit">The unit.</param>
+        public RelativePoint(double x, double y, RelativeUnit unit)
             : this(new Point(x, y), unit)
         {
         }
 
         /// <summary>
-        /// Initializes a new instance of the <see cref="Origin"/> struct.
+        /// Initializes a new instance of the <see cref="RelativePoint"/> struct.
         /// </summary>
-        /// <param name="point">The origin point.</param>
-        /// <param name="unit">The origin unit.</param>
-        public Origin(Point point, OriginUnit unit)
+        /// <param name="point">The point.</param>
+        /// <param name="unit">The unit.</param>
+        public RelativePoint(Point point, RelativeUnit unit)
         {
             _point = point;
             _unit = unit;
         }
 
         /// <summary>
-        /// Gets the origin point.
+        /// Gets the point.
         /// </summary>
         public Point Point => _point;
 
         /// <summary>
-        /// Gets the origin unit.
+        /// Gets the unit.
         /// </summary>
-        public OriginUnit Unit => _unit;
+        public RelativeUnit Unit => _unit;
 
         /// <summary>
-        /// Converts an <see cref="Origin"/> into pixels.
+        /// Converts a <see cref="RelativePoint"/> into pixels.
         /// </summary>
         /// <param name="size">The size of the visual.</param>
         /// <returns>The origin point in pixels.</returns>
         public Point ToPixels(Size size)
         {
-            return _unit == OriginUnit.Pixels ?
+            return _unit == RelativeUnit.Pixels ?
                 _point :
                 new Point(_point.X * size.Width, _point.Y * size.Height);
         }
diff --git a/src/Perspex.SceneGraph/RelativeRect.cs b/src/Perspex.SceneGraph/RelativeRect.cs
index 26afd7d1bb..02b5d63143 100644
--- a/src/Perspex.SceneGraph/RelativeRect.cs
+++ b/src/Perspex.SceneGraph/RelativeRect.cs
@@ -4,14 +4,14 @@
 namespace Perspex
 {
     /// <summary>
-    /// Defines a rectangle that may be defined relative to another rectangle.
+    /// Defines a rectangle that may be defined relative to a containing element.
     /// </summary>
     public struct RelativeRect
     {
         /// <summary>
         /// A rectangle that represents 100% of an area.
         /// </summary>
-        public static readonly RelativeRect Fill = new RelativeRect(0, 0, 1, 1, OriginUnit.Percent);
+        public static readonly RelativeRect Fill = new RelativeRect(0, 0, 1, 1, RelativeUnit.Percent);
 
         /// <summary>
         /// Initializes a new instance of the <see cref="RelativeRect"/> structure.
@@ -21,7 +21,7 @@ namespace Perspex
         /// <param name="width">The width.</param>
         /// <param name="height">The height.</param>
         /// <param name="unit">The unit of the rect.</param>
-        public RelativeRect(double x, double y, double width, double height, OriginUnit unit)
+        public RelativeRect(double x, double y, double width, double height, RelativeUnit unit)
         {
             Rect = new Rect(x, y, width, height);
             Unit = unit;
@@ -32,7 +32,7 @@ namespace Perspex
         /// </summary>
         /// <param name="rect">The rectangle.</param>
         /// <param name="unit">The unit of the rect.</param>
-        public RelativeRect(Rect rect, OriginUnit unit)
+        public RelativeRect(Rect rect, RelativeUnit unit)
         {
             Rect = rect;
             Unit = unit;
@@ -43,7 +43,7 @@ namespace Perspex
         /// </summary>
         /// <param name="size">The size of the rectangle.</param>
         /// <param name="unit">The unit of the rect.</param>
-        public RelativeRect(Size size, OriginUnit unit)
+        public RelativeRect(Size size, RelativeUnit unit)
         {
             Rect = new Rect(size);
             Unit = unit;
@@ -55,7 +55,7 @@ namespace Perspex
         /// <param name="position">The position of the rectangle.</param>
         /// <param name="size">The size of the rectangle.</param>
         /// <param name="unit">The unit of the rect.</param>
-        public RelativeRect(Point position, Size size, OriginUnit unit)
+        public RelativeRect(Point position, Size size, RelativeUnit unit)
         {
             Rect = new Rect(position, size);
             Unit = unit;
@@ -67,7 +67,7 @@ namespace Perspex
         /// <param name="topLeft">The top left position of the rectangle.</param>
         /// <param name="bottomRight">The bottom right position of the rectangle.</param>
         /// <param name="unit">The unit of the rect.</param>
-        public RelativeRect(Point topLeft, Point bottomRight, OriginUnit unit)
+        public RelativeRect(Point topLeft, Point bottomRight, RelativeUnit unit)
         {
             Rect = new Rect(topLeft, bottomRight);
             Unit = unit;
@@ -76,7 +76,7 @@ namespace Perspex
         /// <summary>
         /// Gets the unit of the rectangle.
         /// </summary>
-        public OriginUnit Unit { get; }
+        public RelativeUnit Unit { get; }
 
         /// <summary>
         /// Gets the rectangle.
@@ -90,7 +90,7 @@ namespace Perspex
         /// <returns>The origin point in pixels.</returns>
         public Rect ToPixels(Size size)
         {
-            return Unit == OriginUnit.Pixels ?
+            return Unit == RelativeUnit.Pixels ?
                 Rect :
                 new Rect(
                     Rect.X * size.Width,
diff --git a/src/Perspex.SceneGraph/Visual.cs b/src/Perspex.SceneGraph/Visual.cs
index 3ede93a78c..a3733eb756 100644
--- a/src/Perspex.SceneGraph/Visual.cs
+++ b/src/Perspex.SceneGraph/Visual.cs
@@ -61,8 +61,8 @@ namespace Perspex
         /// <summary>
         /// Defines the <see cref="TransformOrigin"/> property.
         /// </summary>
-        public static readonly PerspexProperty<Origin> TransformOriginProperty =
-            PerspexProperty.Register<Visual, Origin>(nameof(TransformOrigin), defaultValue: Origin.Default);
+        public static readonly PerspexProperty<RelativePoint> TransformOriginProperty =
+            PerspexProperty.Register<Visual, RelativePoint>(nameof(TransformOrigin), defaultValue: RelativePoint.Center);
 
         /// <summary>
         /// Defines the <see cref="ZIndex"/> property.
@@ -172,7 +172,7 @@ namespace Perspex
         /// <summary>
         /// Gets the transform origin of the scene graph node.
         /// </summary>
-        public Origin TransformOrigin
+        public RelativePoint TransformOrigin
         {
             get { return GetValue(TransformOriginProperty); }
             set { SetValue(TransformOriginProperty, value); }
diff --git a/tests/Perspex.RenderTests/Media/VisualBrushTests.cs b/tests/Perspex.RenderTests/Media/VisualBrushTests.cs
index 5bff4198cb..d05b3cf13e 100644
--- a/tests/Perspex.RenderTests/Media/VisualBrushTests.cs
+++ b/tests/Perspex.RenderTests/Media/VisualBrushTests.cs
@@ -288,7 +288,7 @@ namespace Perspex.Direct2D1.RenderTests.Media
                 {
                     Fill = new VisualBrush
                     {
-                        SourceRect = new RelativeRect(40, 40, 100, 100, OriginUnit.Pixels),
+                        SourceRect = new RelativeRect(40, 40, 100, 100, RelativeUnit.Pixels),
                         Visual = new Border
                         {
                             Width = 180,
@@ -329,7 +329,7 @@ namespace Perspex.Direct2D1.RenderTests.Media
                 {
                     Fill = new VisualBrush
                     {
-                        DestinationRect = new RelativeRect(92, 92, 92, 92, OriginUnit.Pixels),
+                        DestinationRect = new RelativeRect(92, 92, 92, 92, RelativeUnit.Pixels),
                         Visual = new Border
                         {
                             Width = 180,
@@ -370,8 +370,8 @@ namespace Perspex.Direct2D1.RenderTests.Media
                 {
                     Fill = new VisualBrush
                     {
-                        SourceRect = new RelativeRect(40, 40, 100, 100, OriginUnit.Pixels),
-                        DestinationRect = new RelativeRect(92, 92, 92, 92, OriginUnit.Pixels),
+                        SourceRect = new RelativeRect(40, 40, 100, 100, RelativeUnit.Pixels),
+                        DestinationRect = new RelativeRect(92, 92, 92, 92, RelativeUnit.Pixels),
                         Visual = new Border
                         {
                             Width = 180,
@@ -412,8 +412,8 @@ namespace Perspex.Direct2D1.RenderTests.Media
                 {
                     Fill = new VisualBrush
                     {
-                        SourceRect = new RelativeRect(0.22, 0.22, 0.56, 0.56, OriginUnit.Percent),
-                        DestinationRect = new RelativeRect(0.5, 0.5, 0.5, 0.5, OriginUnit.Percent),
+                        SourceRect = new RelativeRect(0.22, 0.22, 0.56, 0.56, RelativeUnit.Percent),
+                        DestinationRect = new RelativeRect(0.5, 0.5, 0.5, 0.5, RelativeUnit.Percent),
                         Visual = new Border
                         {
                             Width = 180,
@@ -456,7 +456,7 @@ namespace Perspex.Direct2D1.RenderTests.Media
                     {
                         Stretch = Stretch.None,
                         TileMode = TileMode.Tile,
-                        DestinationRect = new RelativeRect(0.25, 0.25, 0.5, 0.5, OriginUnit.Percent),
+                        DestinationRect = new RelativeRect(0.25, 0.25, 0.5, 0.5, RelativeUnit.Percent),
                         Visual = new Border
                         {
                             Width = 92,
@@ -543,7 +543,7 @@ namespace Perspex.Direct2D1.RenderTests.Media
                     {
                         Stretch = Stretch.None,
                         TileMode = TileMode.FlipX,
-                        DestinationRect = new RelativeRect(0, 0, 0.5, 0.5, OriginUnit.Percent),
+                        DestinationRect = new RelativeRect(0, 0, 0.5, 0.5, RelativeUnit.Percent),
                         Visual = new Border
                         {
                             Width = 92,
@@ -586,7 +586,7 @@ namespace Perspex.Direct2D1.RenderTests.Media
                     {
                         Stretch = Stretch.None,
                         TileMode = TileMode.FlipY,
-                        DestinationRect = new RelativeRect(0, 0, 0.5, 0.5, OriginUnit.Percent),
+                        DestinationRect = new RelativeRect(0, 0, 0.5, 0.5, RelativeUnit.Percent),
                         Visual = new Border
                         {
                             Width = 92,
@@ -629,7 +629,7 @@ namespace Perspex.Direct2D1.RenderTests.Media
                     {
                         Stretch = Stretch.None,
                         TileMode = TileMode.FlipXY,
-                        DestinationRect = new RelativeRect(0, 0, 0.5, 0.5, OriginUnit.Percent),
+                        DestinationRect = new RelativeRect(0, 0, 0.5, 0.5, RelativeUnit.Percent),
                         Visual = new Border
                         {
                             Width = 92,