diff --git a/src/geometry.rs b/src/geometry.rs
index dd7a74d..72b466a 100644
--- a/src/geometry.rs
+++ b/src/geometry.rs
@@ -14,43 +14,43 @@ pub struct Rectangle {
 }
 
 impl Point {
-    pub fn new(x: u32, y: u32) -> Self {
+    pub const fn new(x: u32, y: u32) -> Self {
         Self { x, y }
     }
 
-    pub fn origin() -> Self {
+    pub const fn origin() -> Self {
         Self { x: 0, y: 0 }
     }
 
-    pub fn with_x(&self, x: u32) -> Self {
+    pub const fn with_x(&self, x: u32) -> Self {
         Self { x, y: self.y }
     }
 
-    pub fn with_y(&self, y: u32) -> Self {
+    pub const fn with_y(&self, y: u32) -> Self {
         Self { x: self.x, y }
     }
 
-    pub fn x(&self) -> u32 {
+    pub const fn x(&self) -> u32 {
         self.x
     }
 
-    pub fn y(&self) -> u32 {
+    pub const fn y(&self) -> u32 {
         self.y
     }
 
-    pub fn left_of(&self, other: &Self) -> bool {
+    pub const fn left_of(&self, other: &Self) -> bool {
         self.x < other.x
     }
 
-    pub fn right_of(&self, other: &Self) -> bool {
+    pub const fn right_of(&self, other: &Self) -> bool {
         self.x > other.x
     }
 
-    pub fn above(&self, other: &Self) -> bool {
+    pub const fn above(&self, other: &Self) -> bool {
         self.y < other.y
     }
 
-    pub fn below(&self, other: &Self) -> bool {
+    pub const fn below(&self, other: &Self) -> bool {
         self.y > other.y
     }
 }
@@ -77,7 +77,7 @@ impl PartialEq for Point {
 impl Eq for Point {}
 
 impl Rectangle {
-    pub fn from_corner_width_height(top_left: Point, width: u32, height: u32) -> Rectangle {
+    pub const fn from_corner_width_height(top_left: Point, width: u32, height: u32) -> Rectangle {
         Rectangle {
             top_left,
             width,
@@ -95,19 +95,19 @@ impl Rectangle {
         Rectangle::from_corner_width_height(Point::new(left, top), width, height)
     }
 
-    pub fn at_origin_with_size(width: u32, height: u32) -> Rectangle {
+    pub const fn at_origin_with_size(width: u32, height: u32) -> Rectangle {
         Rectangle::from_corner_width_height(Point::origin(), width, height)
     }
 
-    pub fn width(&self) -> u32 {
+    pub const fn width(&self) -> u32 {
         self.width
     }
 
-    pub fn height(&self) -> u32 {
+    pub const fn height(&self) -> u32 {
         self.height
     }
 
-    pub fn with_width(&self, width: u32) -> Rectangle {
+    pub const fn with_width(&self, width: u32) -> Rectangle {
         Rectangle {
             top_left: self.top_left,
             width,
@@ -115,7 +115,7 @@ impl Rectangle {
         }
     }
 
-    pub fn with_height(&self, height: u32) -> Rectangle {
+    pub const fn with_height(&self, height: u32) -> Rectangle {
         Rectangle {
             top_left: self.top_left,
             width: self.width,
@@ -123,26 +123,26 @@ impl Rectangle {
         }
     }
 
-    pub fn top_left(&self) -> Point {
+    pub const fn top_left(&self) -> Point {
         self.top_left
     }
 
-    pub fn top_right(&self) -> Point {
+    pub const fn top_right(&self) -> Point {
         Point::new(self.top_left.x() + self.width, self.top_left.y())
     }
 
-    pub fn bottom_right(&self) -> Point {
+    pub const fn bottom_right(&self) -> Point {
         Point::new(
             self.top_left.x() + self.width,
             self.top_left.y() + self.height,
         )
     }
 
-    pub fn bottom_left(&self) -> Point {
+    pub const fn bottom_left(&self) -> Point {
         Point::new(self.top_left.x(), self.top_left.y() + self.height)
     }
 
-    pub fn area(&self) -> u32 {
+    pub const fn area(&self) -> u32 {
         self.width * self.height
     }