Classic Size Illusions Poster Set

Six fact-checked size illusion posters: the Müller-Lyer arrows, the Ebbinghaus circles, the Ponzo railway, the moon illusion, the Ames room and the T illusion. Great for classroom walls, bedrooms and science corners.

What’s inside:

- The Müller-Lyer illusion

- The Ebbinghaus illusion

- The Ponzo illusion (with a railway photo)

- The moon illusion (with a moonrise photo)

- The Ames room

- The T illusion

- Credits, licence & sources

Pages: 8 (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. The railway photo (CC0) and the moonrise photo (public domain, Grand Canyon National Park) come via Wikimedia Commons; the other posters use our own drawings. 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.