diff --git a/rtchallenge/src/world.rs b/rtchallenge/src/world.rs
index 7aecc54..5db015e 100644
--- a/rtchallenge/src/world.rs
+++ b/rtchallenge/src/world.rs
@@ -1,3 +1,5 @@
+use derive_builder::Builder;
+
 use crate::{
     intersections::{prepare_computations, Intersections, PrecomputedData},
     lights::PointLight,
@@ -20,7 +22,8 @@ use crate::{
 /// assert_eq!(w.lights.len(), 0);
 /// ```
 
-#[derive(Clone, Debug, Default)]
+#[derive(Builder, Clone, Debug, Default)]
+#[builder(default)]
 pub struct World {
     pub lights: Vec<PointLight>,
     pub objects: Vec<Shape>,