“The 1977 creation by the 20th-century artist Arthur Köpcke was lent to Nuremberg’s Neues Museum by a private collector, and is said to be worth around £68,000. The retired German dentist … said that she started filling in the artwork’s crossword puzzle because it bore the phrases ‘Insert words’ and ‘so it suits.’ … [Her attorney] says that far from harming the work in question, his client has increased its value.”