“He made me depict from memory, in the greatest possible detail, objects I had certainly seen thousands of times without visualizing them properly: a street lamp, a postbox, the tulip design on the stained glass of our own front door. He tried to teach me to find the geometrical coordinations between the slender twigs of a leafless boulevard tree, a system of visual give-and-takes, requiring a precision of linear expression, which I failed to achieve in my youth, but applied gratefully, in my adult instar, not only to the drawing of butterfly genitalia during my seven years at the Harvard Museum of Comparative Zoology, when immersing myself in the bright wellhole of a microscope to record in India ink this or that new structure; but also, perhaps, to certain camera-lucida needs of literary composition.”