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Index

angle 14 depth 8 shadow 8

brain 4–8, 10, 14, floating 14–15 shape 12, 19
16, 20 flower 12–13 squiggles 8–9

circles 6, 18–19 focus 7, 10, 16, 21 tubes 20
color 4, 6, 12, 14, grid 16, 22 tunnel vision 21
20 position 10 waves 10

Read More

Claybourne, Anna. Movers and Sarcone, Gianni A., and
Shakers (The Science of Optical Marie-Jo Waeber. Motion
Illusions). New York: Gareth Madness (Optical Illusions). Lake
Stevens Publishing, 2020 . Forest, CA: Quarto Library, 2019 .

Learn More Online

1 . Go to www.factsurfer.com or scan the QR code below .

2 . Enter “Motion Commotion” into the search box .
3 . Click on the cover of this book to see a list of websites .

About the Author

Spencer Brinker lives and works in Minnesota .

Having twin daughters sometimes makes it
seem like he’s seeing double!

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