diff --git a/game/game.py b/game/game.py
index 9948add..1fca74f 100644
--- a/game/game.py
+++ b/game/game.py
@@ -33,7 +33,7 @@ from game.environment import Environment
 from game.inputs import InputFloat
 from game.batch import Batch
 from game.entity import Entity
-from game.scene import Node, SceneNode, TextureNode, ShaderNode, InputNode, DrawNode, FuncNode
+from game.scene import Group, SceneGroup, TextureGroup, ShaderGroup, InputNode, DrawNode, FuncNode
 from game import sea
 
 proj_hfov = pi * 0.25
@@ -44,11 +44,11 @@ proj_far_z = 3000.0
 sun_direction = math.vec3_normalize((1.0, 0.0, 0.5))
 sun_power = 1.0
 
-class PerfNode(Node):
+class PerfGroup(Group):
     __slots__ = '_count', '_min', '_max', '_total', '_name'
 
     def __init__(self, name, *subnodes):
-        Node.__init__(self, *subnodes)
+        Group.__init__(self, *subnodes)
         self._count = None
         self._min = 10000.0
         self._max = 0.0
@@ -62,7 +62,7 @@ class PerfNode(Node):
 
     def draw(self, time):
         begin = thread_time()
-        Node.draw(self, time)
+        Group.draw(self, time)
         elapsed = (thread_time() - begin) * 1000.0
         if self._count is None:
             self._count = 0
@@ -189,27 +189,27 @@ def create_scene(keyboard, mouse):
     assert tiles_shader.u_height_sampler == tests_shader.u_height_sampler
     assert tiles_shader.u_normal_sampler == tests_shader.u_normal_sampler
 
-    return SceneNode(
-        PerfNode('frame',
-            TextureNode({tiles_shader.u_height_sampler: heightmap, tiles_shader.u_normal_sampler: normalmap},
+    return SceneGroup(
+        PerfGroup('frame',
+            TextureGroup({tiles_shader.u_height_sampler: heightmap, tiles_shader.u_normal_sampler: normalmap},
                 FuncNode(update_camera, (mouse, camera, environment)),
-                TextureNode({tiles_shader.u_texture_sampler: tiles_texture},
-                    ShaderNode(tiles_shader,
+                TextureGroup({tiles_shader.u_texture_sampler: tiles_texture},
+                    ShaderGroup(tiles_shader,
                         InputNode(tiles_shader, camera, environment),
-                        PerfNode('tiles_batch',
+                        PerfGroup('tiles_batch',
                             DrawNode(tiles_batch)))),
                 FuncNode(update_tests, (blob, cube, clouds)),
-                TextureNode({tests_shader.u_texture_sampler: tests_texture},
-                    ShaderNode(tests_shader,
+                TextureGroup({tests_shader.u_texture_sampler: tests_texture},
+                    ShaderGroup(tests_shader,
                         InputNode(tests_shader, camera, environment),
-                        PerfNode('tests_batch',
+                        PerfGroup('tests_batch',
                             DrawNode(tests_batch))))),
             FuncNode(update_sea, (camera, sea_phase)),
-            TextureNode(
+            TextureGroup(
                 {sea_shader.u_polar_sampler: sea_polar_textures, sea_shader.u_detail_sampler: sea_detail_texture},
-                ShaderNode(sea_shader,
+                ShaderGroup(sea_shader,
                     InputNode(sea_shader, camera, environment, sea_phase),
-                    PerfNode('sea_triangles',
+                    PerfGroup('sea_triangles',
                         DrawNode(sea_triangles))))))
 
 def loop(display):
diff --git a/game/scene.py b/game/scene.py
index 980e0af..24d12a0 100644
--- a/game/scene.py
+++ b/game/scene.py
@@ -13,7 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-class Node:
+class Group:
     __slots__ = '_subnodes'
 
     def __init__(self, *subnodes):
@@ -23,34 +23,34 @@ class Node:
         for subnode in self._subnodes:
             subnode.draw(time)
 
-class SceneNode(Node):
+class SceneGroup(Group):
     pass
 
-class TextureNode(Node):
+class TextureGroup(Group):
     __slots__ = '_textures'
 
     def __init__(self, textures, *subnodes):
-        Node.__init__(self, *subnodes)
+        Group.__init__(self, *subnodes)
         self._textures = textures
 
     def draw(self, time):
         items = self._textures.items()
         for slot, texture in items:
             texture.select(slot)
-        Node.draw(self, time)
+        Group.draw(self, time)
         for slot, texture in items:
             texture.unselect(slot)
 
-class ShaderNode(Node):
+class ShaderGroup(Group):
     __slots__ = '_shader'
 
     def __init__(self, shader, *subnodes):
-        Node.__init__(self, *subnodes)
+        Group.__init__(self, *subnodes)
         self._shader = shader
 
     def draw(self, time):
         self._shader.select()
-        Node.draw(self, time)
+        Group.draw(self, time)
         self._shader.unselect()
 
 class InputNode: