sentences:  Duggan argues that they've lost an invaluable piece of art, but the Doctor assures him that the copy, still done by Leonardo's hand, will go unnoticed, and that art is worthless if its monetary value is all that matters.The Doctor and Romana say goodbye to Duggan at the Eiffel Tower .Writer David Fisher had contributed two scripts to "Doctor Who"s sixteenth season – "The Stones of Blood" and "The Androids of Tara" – and was asked by producer Graham Williams for further story ideas.