diff --git a/src/renderer.lisp b/src/renderer.lisp
index 16714a7..07df1f0 100644
--- a/src/renderer.lisp
+++ b/src/renderer.lisp
@@ -5,9 +5,12 @@
 #version 330 core
 layout (location = 0) in vec3 aPos;
 
+out vec4 vertexColor;
+
 void main()
 {
     gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+    vertexColor = vec4(0.5, 0.0, 0.0, 1.0);
 }
 "))
 
@@ -15,15 +18,19 @@ void main()
 #version 330 core
 out vec4 FragColor;
 
+// in vec4 vertexColor;
+uniform vec4 ourColor;
+
 void main()
 {
-    FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
+    FragColor = ourColor;
 }
 "))
 
 
 (defparameter *vbo* 0)
 (defparameter *vao* 0)
+(defparameter *ebo* 0)
 (defparameter *shader-program* 0)
 
 (defun init-renderer ()
@@ -40,23 +47,47 @@ void main()
     (gl:delete-shader vertex-shader)
     (gl:delete-shader fragment-shader)
     (setf *vbo* (gl:gen-buffer))
+    (setf *ebo* (gl:gen-buffer))
     (setf *vao* (gl:gen-vertex-array))
 
     (gl:bind-vertex-array *vao*)
     (gl:bind-buffer :array-buffer *vbo*)
+    (gl:bind-buffer :element-array-buffer *ebo*)
 
-    (let ((arr (gl:alloc-gl-array :float 12))
-	  (vertices #(-0.5 -0.5 0.0
+    (let* ((vertices #( 0.5  0.5 0.0
 		       0.5 -0.5 0.0
-		       0.0  0.5 0.0)))
+		      -0.5 -0.5 0.0
+		      -0.5  0.5 0.0))
+	   (arr (gl:alloc-gl-array :float (length vertices))))
       (dotimes (i (length vertices))
 	(setf (gl:glaref arr i) (aref vertices i)))
       (gl:buffer-data :array-buffer :static-draw arr)
       (gl:free-gl-array arr))
 
+    (let* ((indices #(0 1 3
+		      1 2 3))
+	   (arr (gl:alloc-gl-array :int (length indices))))
+      (dotimes (i (length indices))
+	(setf (gl:glaref arr i) (aref indices i)))
+      (gl:buffer-data :element-array-buffer :static-draw arr)
+      (gl:free-gl-array arr))
+
     (gl:vertex-attrib-pointer 0 3 :float nil 0 (cffi:null-pointer))
     (gl:enable-vertex-attrib-array 0)))
 
+(defun enable-wireframe ()
+ (gl:polygon-mode :front-and-back :line))
+
+(defun disable-wireframe ()
+ (gl:polygon-mode :front-and-back :fill))
+
+(let ((wireframe nil))
+  (defun toggle-wireframe ()
+    (if wireframe
+	(disable-wireframe)
+	(enable-wireframe))
+    (setf wireframe (not wireframe))))
+
 (defun render ()
   (gl:clear :color-buffer)
   ;; (gl:with-pushed-matrix
@@ -64,7 +95,10 @@ void main()
   ;;   (gl:rect -25 -25 25 25))
 
   (gl:use-program *shader-program*)
+  (gl:uniformf (gl:get-uniform-location *shader-program* "ourColor")
+	       0.0 (+ (/ (sin (glfw:get-time)) 2) 0.5) 0.0 1.0)
   (gl:bind-vertex-array *vao*)
-  (gl:draw-arrays :triangles 0 3)
+  (gl:draw-elements :triangles (gl:make-null-gl-array :unsigned-int) :count 6)
+  (gl:bind-vertex-array 0)
 
   (glfw:swap-buffers))
diff --git a/src/window.lisp b/src/window.lisp
index 331008a..00d9787 100644
--- a/src/window.lisp
+++ b/src/window.lisp
@@ -17,7 +17,9 @@
 (glfw:def-key-callback key-callback (window key scancode action mod-keys)
   (declare (ignore window scancode mod-keys))
   (when (and (eq key :escape) (eq action :press))
-    (glfw:set-window-should-close)))
+    (glfw:set-window-should-close))
+  (when (and (eq key :space) (eq action :press))
+    (toggle-wireframe)))
 
 (glfw:def-mouse-button-callback mouse-button-callback (window button action mod-keys)
     (declare (ignore window button action mod-keys)))