diff --git a/u02/main.c b/u02/main.c
index bb42ca8..d89fef7 100644
--- a/u02/main.c
+++ b/u02/main.c
@@ -19,6 +19,22 @@ GLfloat speedY = -0.0005f;
 
 #define NUM_TRIANGLES 8
 
+typedef struct {
+	GLfloat x;
+	GLfloat y;
+} Point;
+
+typedef struct {
+	Point p1;
+	Point p2;
+	Point p3;
+} Triangle;
+
+typedef struct {
+	Triangle t1;
+	Triangle t2;
+} TriangleRect;
+
 void createRect(GLfloat* vertexArray, GLfloat posx, GLfloat posy, GLfloat width, GLfloat height) {
 	vertexArray[0] = posx;
 	vertexArray[1] = posy;
@@ -116,24 +132,12 @@ void init(void) {
 	}
 
 
+	TriangleRect triangleVertices[4];
 
-	// create triangle buffer
-	// GLfloat triangleVertices[] =
-	// 	{//   X    Y
-	// 		 -0.5f,   0.5f, 1.0f, 0.0f, 0.0f,
-	// 		 -0.5f,  -0.5f, 0.0f, 1.0f, 0.0f,
-	// 		 -0.75f, -0.5f, 0.0f, 0.0f, 1.0f,
-
-	// 		 -0.5f,   0.5f, 1.0f, 0.0f, 0.0f,
-	// 		 -0.75f,  0.5f, 0.0f, 1.0f, 0.0f,
-	// 		 -0.75f, -0.5f, 0.0f, 0.0f, 1.0f
-	// 	};
-	GLfloat triangleVertices[48];
-
-	createCenterRect(&triangleVertices[0], -0.2f, 0.0f, 0.1f, 1.2f);
-	createCenterRect(&triangleVertices[12],  0.2f, 0.0f, 0.1f, 1.2f);
-	createCenterRect(&triangleVertices[24],  0.0f, 0.0f, 0.3f, 0.1f);
-	createCenterRect(&triangleVertices[36],  0.0f, -0.8f, 0.5f, 0.1f);
+	createCenterRect((GLfloat*)&triangleVertices[0], -0.2f, 0.0f, 0.1f, 1.2f);
+	createCenterRect((GLfloat*)&triangleVertices[1],  0.2f, 0.0f, 0.1f, 1.2f);
+	createCenterRect((GLfloat*)&triangleVertices[2],  0.0f, 0.0f, 0.3f, 0.1f);
+	createCenterRect((GLfloat*)&triangleVertices[3],  0.0f, -0.8f, 0.5f, 0.1f);
 
 
 	GLuint triangleVertexBufferObject;