Diego Rodriguez de Silva y Velazquez (1599 - 1660) was the leading artist in the court of King Philip IV of Spain, and is best known for his portraits of the royal family, including his masterpiece, Las Meninas.
Back in his London studio, he persuaded a friend to place a blindfold over his eyes, escort him by taxi to Heathrow, catch a flight to Madrid, lead him into the Prado museum, and position him in directly in front of Velazquez's Las Meninas.