public function indexAction()
 {
     /* Once upon a time $shapes was extracted from $_REQUEST and successfully validated.
      *   And now $shapes is array like this:
      *   $shapes = [
      *       ['type' => 'circle', 'params' => [...]],
      *       ['type' => 'circle', 'params' => [...]]
      *   ];
      *
      *   We believe in it.
      */
     $shapes = Request::getShapes();
     $shapes = new ShapesCollection($shapes);
     $view = ViewFactory::getView(Request::getViewType());
     while ($shape = $shapes->getShape()) {
         $view->assignShape($shape);
     }
     $view->render();
 }