public void checkCollisions()
    {
        if (getEntities() == null)  return;
        
        List<Entity> entities = getEntities().getList(null);
        for (Entity other : entities)
        {
            if (collidesWith((Positioned)other, false))
            {
                reactToCollision(other, collidesWith((Positioned)other, true));
            }
        }
    }