Sentence 1: I learned, for example, how a diadem, brooch, or bracelet could be invisibly hinged so as to be completely flexible in all directions, not a rigid little beast of unyielding metal and stone, but supple, tender toward the body, changeable in mood.

Sentence 2: A brooch can be made with an invisible hinge.

If the first sentence is true, then is the second sentence true?
yes