A 91-year-old woman has been questioned by police in Germany'" after she filled in the blanks in a piece of modern art based on a crossword puzzle, reports the Telegraph.

The pensioner, who has not been named under German privacy law, was questioned under caution after she filled in the work valued at 80,000 with a biro.

"Reading-work-piece", a 1977 work by Arthur Kpcke of the Fluxus movement, essentially looks like an empty crossword puzzle.Next to the work is a sign which reads: "Insert words'.The hapless pensioner explained to police that she was simply following the instructions."The lady told us she had taken the notes as an invitation to complete the crossword,' a police spokesman said.