diff --git a/tinker/Makefile b/tinker/Makefile
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--- /dev/null
+++ b/tinker/Makefile
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+run:
+	ocamlfind ocamlc -package graphics -linkpkg cube.ml -o cube
+	./cube
diff --git a/tinker/cube b/tinker/cube
new file mode 100755
index 0000000..d46aee1
Binary files /dev/null and b/tinker/cube differ
diff --git a/tinker/cube.ml b/tinker/cube.ml
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--- /dev/null
+++ b/tinker/cube.ml
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+open Graphics;;
+
+let window_w = 800.;;
+let window_h = 800.;;
+
+let screen_space (x, y) =
+  (
+    int_of_float ((x +. 1.) /. 2. *. window_w),
+    int_of_float ((1. -. (y +. 1.) /. 2.) *. window_h)
+  );;
+
+let project (x, y, z) =
+  (x /. z, y /. z);;
+
+let rotate_y (x, y, z) angle =
+  let ox = x in
+  let oz = z in
+  (
+    ox *. cos(angle) -. oz *. sin(angle),
+    y,
+    ox *. sin(angle) +. oz *. cos(angle)
+  );;
+
+let translate_z (x, y, z) dz =
+  (x, y, z +. dz);;
+
+(* CUBE *)
+let vertecies = [
+  (0.3, 0.3, 0.3);
+  (-0.3, 0.3, 0.3);
+  (-0.3, -0.3, 0.3);
+  ( 0.3, -0.3, 0.3);
+  (0.3, 0.3, -0.3);
+  (-0.3, 0.3, -0.3);
+  (-0.3, -0.3, -0.3);
+  (0.3, -0.3, -0.3)
+];;
+
+let faces = [
+  (0, 1, 2, 3); (* front *)
+  (4, 5, 6, 7); (* back *)
+  (0, 1, 5, 4); (* top *)
+  (2, 3, 7, 6)  (* bottom *)
+];;
+
+let draw_line (x1, y1) (x2, y2) =
+  moveto x1 y1;
+  lineto x2 y2;;
+
+let rec get_vertex v i =
+  match v with
+  | [] -> (0., 0., 0.)
+  | x :: xs ->
+    if i = 0 then x
+    else get_vertex xs (i - 1);;
+
+let draw_face (a, b, c, d) angle =
+  let va = (get_vertex vertecies a) in
+  let vb = (get_vertex vertecies b) in
+  let vc = (get_vertex vertecies c) in
+  let vd = (get_vertex vertecies d) in
+
+  let va = rotate_y va angle in
+  let vb = rotate_y vb angle in
+  let vc = rotate_y vc angle in
+  let vd = rotate_y vd angle in
+
+  let va = translate_z va 1.25 in
+  let vb = translate_z vb 1.25 in
+  let vc = translate_z vc 1.25 in
+  let vd = translate_z vd 1.25 in
+
+  let va = project va in
+  let vb = project vb in
+  let vc = project vc in
+  let vd = project vd in
+
+  let va = screen_space va in
+  let vb = screen_space vb in
+  let vc = screen_space vc in
+  let vd = screen_space vd in
+
+  draw_line va vb;
+  draw_line vb vc;
+  draw_line vc vd;
+  draw_line vd va;;
+
+let rec iter_faces faces angle =
+  match faces with
+  | [] -> ()
+  | (a, b, c, d) :: fs ->
+    draw_face (a, b, c, d) angle;
+    iter_faces fs angle;;
+
+let rec spin_cube angle =
+  clear_graph ();
+
+  set_color (rgb 0 0 0);
+  fill_rect 0 0 800 800;
+
+  set_color cyan;
+
+  iter_faces faces angle;
+
+  Graphics.synchronize ();
+
+  spin_cube (angle +. 0.0001);;
+
+let () =
+  open_graph " 800x800+560+140";
+
+  auto_synchronize false;
+
+  spin_cube 0.;
+
+  close_graph ()