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.