diff --git a/rtiow/src/scenes/tutorial.rs b/rtiow/src/scenes/tutorial.rs
index 7e1ab89..2c172e6 100644
--- a/rtiow/src/scenes/tutorial.rs
+++ b/rtiow/src/scenes/tutorial.rs
@@ -9,7 +9,9 @@ use crate::moving_sphere::MovingSphere;
 use crate::renderer::Opt;
 use crate::renderer::Scene;
 use crate::sphere::Sphere;
+use crate::texture::CheckerTexture;
 use crate::texture::ConstantTexture;
+use crate::texture::Texture;
 use crate::vec3::Vec3;
 
 pub fn new(opt: &Opt) -> Scene {
@@ -30,23 +32,26 @@ pub fn new(opt: &Opt) -> Scene {
         time_min,
         time_max,
     );
-    let ground_color = if opt.use_accel {
-        ConstantTexture::new(Vec3::new(1.0, 0.4, 0.4))
+    let ground_color: Box<dyn Texture> = if opt.use_accel {
+        Box::new(CheckerTexture::new(
+            ConstantTexture::new([0., 0., 0.]),
+            ConstantTexture::new([1.0, 0.4, 0.4]),
+        ))
     } else {
-        ConstantTexture::new(Vec3::new(0.4, 1.0, 0.4))
+        Box::new(ConstantTexture::new(Vec3::new(0.4, 1.0, 0.4)))
     };
 
     let objects: Vec<Box<dyn Hit>> = vec![
         //let world: Box<Hit> = Box::new(HitableList::new(vec![
-        Box::new(Sphere::new([1., 0., 0.], 0.5, Dielectric::new(1.5))),
+        Box::new(Sphere::new([1., 0.5, 1.], 0.5, Dielectric::new(1.5))),
         Box::new(Sphere::new(
             Vec3::new(0., 0., -1.),
             0.5,
             Lambertian::new(ConstantTexture::new(Vec3::new(0.1, 0.2, 0.5))),
         )),
         Box::new(Sphere::new(
-            Vec3::new(0., -100.5, -1.),
-            100.,
+            Vec3::new(0., -1000.5, -1.),
+            1000.,
             Lambertian::new(ground_color),
         )),
         Box::new(Sphere::new(
diff --git a/rtiow/src/texture/mod.rs b/rtiow/src/texture/mod.rs
index f732300..c33e534 100644
--- a/rtiow/src/texture/mod.rs
+++ b/rtiow/src/texture/mod.rs
@@ -25,6 +25,12 @@ impl Texture for Arc<dyn Texture> {
     }
 }
 
+impl Texture for Box<dyn Texture> {
+    fn value(&self, u: f32, v: f32, p: Vec3) -> Vec3 {
+        (**self).value(u, v, p)
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;