diff --git a/pmc/include/cube.h b/pmc/include/cube.h
--- a/pmc/include/cube.h
+++ b/pmc/include/cube.h
@@ -12,15 +12,16 @@
 
 class Cube:public Drawable {
   private:
-    Vector * P[8];
+    algebra::Vector * P[8];
     int height;
 
   public:
-    Cube (Surface *, Vector&, Vector&, Vector&, Vector&, int);
+    Cube (Surface *, algebra::Vector &, algebra::Vector &, algebra::Vector &, algebra::Vector &, int);
+    Cube (Surface *, algebra::Vector[4], int);
     Cube (Surface *);
 
     virtual ~ Cube ();
     void show ();
-    void move (Vector);
+    void move (algebra::Vector);
 };
 #endif