diff --git a/arcade/experimental/basic_renderer.py b/arcade/experimental/examples/basic_renderer.py
similarity index 77%
rename from arcade/experimental/basic_renderer.py
rename to arcade/experimental/examples/basic_renderer.py
index 0148931b1..6aa1adf8a 100644
--- a/arcade/experimental/basic_renderer.py
+++ b/arcade/experimental/examples/basic_renderer.py
@@ -57,21 +57,17 @@ def __init__(self, width, height, title):
         self.quad_2 = geometry.quad_2d(pos=(0.5, 0.5))
 
     def on_draw(self):
-        try:
-            self.clear()
-            self.color_program['color'] = (
-                (math.sin(self.time) + 1.0) / 2,
-                (math.sin(self.time + 2) + 1.0) / 2,
-                (math.sin(self.time + 3) + 1.0) / 2,
-                1.0
-            )
-            self.quad_1.render(self.color_program)
-            self.quad_2.render(self.uv_program)
-
-            arcade.draw_circle_filled(100, 100, 100, arcade.color.APPLE_GREEN)
+        self.clear()
+        self.color_program['color'] = (
+            (math.sin(self.time) + 1.0) / 2,
+            (math.sin(self.time + 2) + 1.0) / 2,
+            (math.sin(self.time + 3) + 1.0) / 2,
+            1.0
+        )
+        self.quad_1.render(self.color_program)
+        self.quad_2.render(self.uv_program)
 
-        except Exception:
-            exit(1)
+        arcade.draw_circle_filled(100, 100, 100, arcade.color.APPLE_GREEN)
 
     def on_update(self, dt):
         self.time += dt
diff --git a/arcade/experimental/examples/geometry_shader.py b/arcade/experimental/examples/geometry_shader.py
index 9c6a4b158..9c0fe2242 100644
--- a/arcade/experimental/examples/geometry_shader.py
+++ b/arcade/experimental/examples/geometry_shader.py
@@ -47,29 +47,33 @@ def __init__(self, width, height, title):
                 // Get the position emitted from the vertex shader
                 // We get the 0th element because point primitives only have 1 position.
                 vec4 pos = gl_in[0].gl_Position;
-                float offset = 0.02 + sin(time * 5.0) / 200.0;
+                float offset = 0.02 + sin(time * 5.0 + gl_PrimitiveIDIn) / 200.0;
 
                 float rot = time + length(pos) * 10.0;
                 mat2 rotate = mat2(
                     cos(rot), -sin(rot),
                     sin(rot),  cos(rot)
                 );
-                
+                vec3 color = vec3(
+                    (sin(time + gl_PrimitiveIDIn) + 1.0) / 2.0,
+                    (sin(time + 2 + gl_PrimitiveIDIn) + 1.0) / 2.0,
+                    (sin(time + 3 + gl_PrimitiveIDIn) + 1.0) / 2.0
+                );
                 // Emit 4 vertices around the original vertex position making a quad
                 gl_Position = pos + vec4(rotate * vec2(-offset, offset), 0.0, 0.0);
-                gs_color = vec3(pos.x, pos.y, 0.5);
+                gs_color = color;
                 EmitVertex();
 
                 gl_Position = pos + vec4(rotate * vec2(-offset, -offset), 0.0, 0.0);
-                gs_color = vec3(pos.x, pos.y, 0.5);
+                gs_color = color;
                 EmitVertex();
 
                 gl_Position = pos + vec4(rotate * vec2(offset, offset), 0.0, 0.0);
-                gs_color = vec3(pos.x, pos.y, 0.5);
+                gs_color = color;
                 EmitVertex();
 
                 gl_Position = pos + vec4(rotate * vec2(offset, -offset), 0.0, 0.0);
-                gs_color = vec3(pos.x, pos.y, 0.5);
+                gs_color = color;
                 EmitVertex();
 
                 // Done with the primitive
diff --git a/arcade/gui.py b/arcade/gui.py
index ca060fad5..5d964b331 100644
--- a/arcade/gui.py
+++ b/arcade/gui.py
@@ -400,7 +400,7 @@ class Theme:
     DEFAULT_FONT_NAME = ('Calibri', 'Arial')
 
     def __init__(self):
-        self.button_textures: Dict[str, Optional['', arcade.Texture]] =\
+        self.button_textures: Dict[str, Optional[str, arcade.Texture]] =\
             {'normal': '', 'hover': '', 'clicked': '', 'locked': '', }
         self.menu_texture = ""
         self.window_texture = ""
diff --git a/arcade/tilemap.py b/arcade/tilemap.py
index 19292cab0..a7061753f 100644
--- a/arcade/tilemap.py
+++ b/arcade/tilemap.py
@@ -468,7 +468,7 @@ def process_layer(map_object: pytiled_parser.objects.TileMap,
                   layer_name: str,
                   scaling: float = 1,
                   base_directory: str = "",
-                  use_spatial_hash: Optional[bool] = None) -> SpriteList:
+                  use_spatial_hash: bool = False) -> SpriteList:
     """
     This takes a map layer returned by the read_tmx function, and creates Sprites for it.