Don’t Trust Your Eyes! Kids’ Size Illusion Worksheets

Don’t Trust Your Eyes! Size illusion worksheets for ages 6 to 11: measure lines with fins, spot which shape is bigger (and find out they’re the same), draw your own illusion, do number puzzles with real illusion facts, solve a maze, colour two moons and a tall hat, with an answer key and an Illusion Detective certificate.

What’s inside:

- How long is each line? Guess and measure

- Which one is bigger? Spot the trick

- Add the fins! Draw your own illusion

- Number puzzles using real illusion facts

- Maze: help the eye find the ruler

- Two colouring pages: two moons and the tall hat

- Word search

- True or false

- Answer key

- Illusion Detective certificate

- Credits, licence & sources

Pages: 13 (including cover and credits). Sizes: A4 (210 × 297 mm) and US Letter (8.5 × 11 in), both PDFs included in one zip.

Printing: Print at 100% / actual size on A4 or US Letter, so the drawings keep their true measurements. Inside pages use light backgrounds and print well in black and white; covers are dark, so start from page 2 to save ink.

Every fact is checked against Michael Bach’s Optical Illusions & Visual Phenomena, Encyclopaedia Britannica and the Exploratorium (checked 31 Oct 2026), and the sources are listed on each pack’s credits page. All drawings are our own; there are no photos in this pack. Drawings, puzzles and layouts are REALLYBYTE’s own work. Not endorsed by Michael Bach, Britannica or the Exploratorium.

Licence: personal and single-classroom use. You may print as many copies as you need for your own family or your own class, and share it with your class through a password-protected platform. Please don’t resell, re-upload or share it publicly. For school-wide use, please email info@reallybyte.com.

Made by REALLYBYTE, the team behind size.illusions.im. Questions: info@reallybyte.com

This is a digital download: no physical item will be shipped.