We have observed the gravitational field generated by lead balls. The classic example is the Cavendish experiment [1] which is rather important historically for figuring out the value of the gravitational constant.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cavendish_experiment" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cavendish_experiment</a>