private void checkBounds(Shape block) {
  boolean collisionDetected = false;
  for (Shape static_bloc : nodes) {
    if (static_bloc != block) {
      static_bloc.setFill(Color.GREEN);

      if (block.getBoundsInParent().intersects(static_bloc.getBoundsInParent())) {
        collisionDetected = true;
      }
    }
  }

  if (collisionDetected) {
    block.setFill(Color.BLUE);
  } else {
    block.setFill(Color.GREEN);
  }
}