Many famous painters employ preliminary sketches before embarking on the final version of their work. Yet frequently these preliminary sketches are beautiful and accomplished works of art in their own right. Museums with small budgets will display these preliminary works instead of what the artists consider to be their finished works of art. Which one of the following propositions is best illustrated by the situation described above? ["Artists' preliminary sketches are as beautiful as the final versions of their work.", 'Artifacts may have uses different from those intended by their creators.', 'Artists are not the best judges of the value of their own work.', 'A finished work of art cannot be produced without the execution of a high-quality preliminary sketch.']