diff --git a/README.md b/README.md
index 597ef3f..eb03d70 100644
--- a/README.md
+++ b/README.md
@@ -30,3 +30,7 @@ The Web Site of the book: http://raytracerchallenge.com/
 | Chapiter 10               | Chapiter 11 partie 01         |  Chapiter 11 partie 02         |
 |:------------------------: | :---------------------------: | :----------------------------: |
 |![10](data/chapter_10.png) | ![11](data/chapter_11_p1.png) | ![11](data/chapter_11_p2.png)  |
+
+| Chapiter 12               | Chapiter 13                   |  Chapiter 14                   |
+|:------------------------: | :---------------------------: | :----------------------------: |
+|![12](data/chapter_12.png) |                               |                                |
diff --git a/apps/chapter_12.cpp b/apps/chapter_12.cpp
index f3b3201..6341b37 100644
--- a/apps/chapter_12.cpp
+++ b/apps/chapter_12.cpp
@@ -252,9 +252,9 @@ int main(void)
     // Configure the camera.
     // the_camera = Camera(100, 50, 0.7805);
     // the_camera = Camera(320, 200, 0.7805);
-    // the_camera = Camera(640, 480, 0.7805);
-    the_camera = Camera(960, 480, 0.7805);
-    // the_camera = Camera(2400, 1200, 0.7805);
+    the_camera = Camera(640, 480, 0.7805);
+    // the_camera = Camera(960, 480, 0.7805);
+    //  the_camera = Camera(2400, 1200, 0.7805);
 
     the_camera.set_transform(
         Matrix::view_transform(Tuple::Point(8, 6, -8), Tuple::Point(0, 3, 0), Tuple::Vector(0, 1, 0)));
diff --git a/data/chapter_12.png b/data/chapter_12.png
new file mode 100644
index 0000000..e952886
Binary files /dev/null and b/data/chapter_12.png differ