A clean, precise, and visually striking version of the classic Jastrow Illusion, redesigned for modern 3D printing. This timeless optical trick demonstrates how two identical curved pieces can appear dramatically different in size—right before your eyes.
🎩 What This Model Does
The Jastrow Illusion is a powerful demonstration of how our brains interpret shape, curve, and perspective. When the two pieces are placed one above the other, the top piece looks noticeably longer. Swap their positions, and the effect reverses instantly. It’s simple, baffling, and endlessly repeatable.
🛠️ Printing & Assembly
Designed for FDM printers
Prints flat
Works beautifully in PLA
High contrast colours recommended for maximum visual impact
🌟 Why This Version Stands Out
Optimised geometry for a crisp, clear illusion from any viewing angle
Smooth, consistent curves that print cleanly on most machines
Classroom‑friendly design ideal for teachers, presenters, and STEM demos
Pocket‑sized format perfect for walk‑around demonstrations or desk toys
🎁 Perfect For
Magicians wanting a quick, visual opener
Teachers explaining perception, psychology, or geometry
Makers who enjoy printing clever visual puzzles
Anyone who loves a “wait… what?!” moment