diff --git a/src/main.rs b/src/main.rs
index 23bc058..65b2fbc 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -51,6 +51,12 @@ struct BouncingImage {
     rate: u32,
 }
 
+trait Drawable {
+    // Associated function signature; `Self` refers to the implementor type.
+
+    fn draw_and_move(&mut self, display: &mut Display);
+
+}
 impl BouncingImage {
     /// Initializes a new BouncingImage.
     fn new(img_file: &str, move_x: i32, move_y: i32, rate: u32, start_x: i32, start_y: i32) -> Self {
@@ -75,7 +81,8 @@ impl BouncingImage {
         }
         bb
     }
-
+}
+impl Drawable for BouncingImage {
     /// Draws the image and updates its position.
     fn draw_and_move(&mut self, display: &mut Display) {
         display.draw_png(&self.img, self.x, self.y);