Lisa Knopp - Field of Vision

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title	:	Field of Vision
author	:	Knopp, Lisa.
publisher	:	University of Iowa Press
isbn10 | asin	:	0877455511
print isbn13	:	9780877455516
ebook isbn13	:	9781587291272
language	:	English
subject	Nature, Natural history.
publication date	:	1996
lcc	:	QH81.K676 1997eb
ddc	:	814/.54
subject	:	Nature, Natural history.

Page iii Field of Vision By Lisa Knopp UNIVERSITY OF IOWA PRESS IOWA CITY

Page iv University of Iowa Press Iowa City 52242 Copyright 1996 by the University of Iowa Press All rights reserved Printed in the United States of America Design by Karen Copp No part of this book may be reproduced or used in any form or by any means, electronic or mechanical, including photocopying and recording, without permission in writing from the publisher. Printed on acid-free paper Library of Congress Cataloging-in-Publication Data Knopp, Lisa Field of vision / by Lisa Knopp. p. cm. ISBN 0-87745-551-1 (pbk.) 1. Visual perception. 2. Visual discrimination. 3. Perception. 4. Human information processing. I. Title. BF241.K62 1996 814'.54-dc20 95-52045 CIP 01 00 99 98 97 96 P 5 4 3 2 1

Page v For my parents, Joseph Knopp and Patricia Parris Knopp

Page vii Contents Acknowledgments ix Preface xi Local Geography 1 Pheasant Country 14 Edges 22 Houseguest 35 Excavations 39 Sky Watch 49 Hard Remains 59 Wildflowers 70 Natural Resistance 73 Seeing 'Possum 80 Open Water 93 Still Center 107 Interiors 110 Field Guide 120 Rustlings 125 Field of Vision 129

Page ix Acknowledgments I gratefully acknowledge the contributions of those who read or talked me through parts of this manuscript: Hilda Raz, Fran Kaye, and Les Whipp at the University of Nebraska; my former office mate, Evelyn Funda, a keen and knowledgeable observer of the natural world who always put her own work aside to help me with mine; my mother, Patricia Knopp, who directed my vision to pheasants, mayflies, and other kin; my former husband, Colin Ramsay, who provided technical assistance and lessons in the art of seeing. I would also like to acknowledge the editors of the following publications for the care they took with my essays: Creative Nonfiction ("Excavations," September 1995), Farmers' Market ("Sky Watch," Fall/Winter 1995, and ''Edges," Fall/Winter 199394), The Journal ("Hard Remains," Spring 1996), NEBRASKA-land ("Houseguest,'' August/September 1995, "Still Center," August 1993, and "Wildflowers," March 1992), Cimarron Review ("Seeing 'Possum," July 1992), South Dakota Review ("Field of Vision," Autumn 1990), and Nortwest Review ("Pheasant Country," Summer 1990).

Page x But I saw these visions not in dreams, nor sleeping, nor in frenzy, nor with the eyes of my body, neither did I hear them with my exterior ears, nor in hidden places did I perceive them, but watching them, and looking carefully in an innocent mind, with the eyes and ears of the interior man, in open places, did I perceive them according to the Will of God. HILDEGARD OF BINGEN (10981179), The Visions of St. Hildegard

Page xi Preface When we look directly at a subject, we move the eye so that the image falls on the fovea centralis, a tiny depression in the retina, smaller than the head of a pin. While our field of vision is spread over a 240-degree angle, we see only the 1.7 degrees covered by the fovea, because there vision is most acute. Still, we can quickly discern quite a bit of detail. We do this by rapidly scanning, moving our eyes in quick, jerking, and largely unconscious movements so that one part of the scene after another falls on the fovea. To move from one image in the scene to the next takes only milliseconds. Within a few seconds we can construct a detailed picture.

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