   defp corners(game = {_, _, game_id}) do
     dimensions()
     |> corner_points()
-    |> Enum.each(fn p -> asteroid(game_id, p) end)
+    |> Enum.each(fn p -> stationary_asteroid(game_id, p) end)
 
     game
   end


  defp this_way_up(game = {_, _, game_id}) do
    [w, h] = dimensions()
    p = %Point{x: w * 0.8, y: h * 0.9}
    north = :math.pi() / 2
    ship(game_id, Point.translate(p, -60, 0), "THI", north)
    ship(game_id, Point.translate(p, 0, 0), "SWA", north)

          do: Point.translate(p, radius + x * radius * 2, radius + y * radius * 2)

    points = Enum.take(points, 16)
    Enum.map(points, fn p -> asteroid_drifting_west(game_id, p, radius) end)
  end

  defp ship(game_id, pos, tag, theta, radius \\ 20.0) do
