Copyright © Monty Lyman 2021
Published by arrangement with Intercontinental Literary Agency
Ltd, through The Grayhawk Agency Ltd.
Simplified Chinese translation copyright 2022 by United Sky
(Beijing) New Media Co., Ltd.
All rights reserved.
The checker-shadow illusion, copyright E. H. Adelson, 1995.
The‘Thatcher’Illusion: image manipulation copyright Rob
Bogaerts CCO.
All other text illustrations by Global Blended Learning.