The only tragic part of the making of was Jean Marais's terrible make-up which used to take five hours and from which he emerged as though after a surgical operation. Laurence Olivier said to me one day that he would never have had the strength to undergo such torture. I maintain that it took Marais's passion for his profession and his love for his dog to have persisted with such fortitude to pass from the human race into the animal one. What was in fact due to the genius of an actor was ascribed by the critics to the perfection of a mask. But there was no mask, and to live the part of the beast, Marais in his dressing-room went through the terrible phases of Dr. Jekyll's transformation into Mr. Hyde.