Sugihara's Circle/Square Optical Illusion 3D Print

The toy they will ask about long after the party.

14k downloads in the maker community

$19.99

Color: Gray

Printed in the USA when you order.

1.You order it
2.We print it fresh
3.It ships to you

Mesmerizing optical illusion that appears round from one angle and square from another
Based on Kokichi Sugihara's famous ambiguous cylinder design, mathematically proven
Perfect conversation starter for desks, shelves, or classrooms
Explore the intersection of mathematics, art, and visual perception

Experience one of mathematics' most captivating optical illusions. This 3D printable model recreates Kokichi Sugihara's famous Circle/Square illusion—a shape that looks like a circular cylinder to the naked eye but transforms into a square cylinder when viewed in a mirror. It's a stunning demonstration of how perspective and geometry can trick our perception.

Designed by Mathematics Professor Dave Richeson at Dickinson College, this illusion has been featured in academic journals and online communities of mathematicians and puzzle enthusiasts worldwide. The design elegantly proves that a single 3D object can simultaneously appear as two completely different shapes depending on your viewpoint and reflection.

Ideal for math teachers, puzzle lovers, optical illusion collectors, or anyone fascinated by the interplay between mathematics and visual deception. Once printed, this tactile model invites exploration and repeated interaction—each angle reveals something new.