Magic Octagon Coin – Arrow Illusion Brain Teaser

Magic Octagon Coin – Arrow Illusion Brain Teaser

Can you predict which way the arrow will point? This simple little coin might trick your brain!

The Magic Octagon is a fun 3D printable brain teaser featuring an octagonal coin with an arrow on each side, positioned at 90 degrees to each other.

Here's the challenge:

• Hold the coin with the front arrow pointing up.

• Rotate it 45 degrees clockwise.

• Before flipping it over, try to predict which direction the arrow on the back will point.

• Now flip it over and check your answer!

• Repeat the experiment, but this time rotate the coin 45 degrees counterclockwise.

Surprised? Even though the arrows never change their positions, the results can be surprisingly difficult to predict!

There's no hidden mechanism or actual magic involved. It's a clever little geometric puzzle that challenges your spatial reasoning and intuition.

I designed this model from scratch, inspired by this fascinating video:

Printing Information

The included 3MF file is configured for two-color printing on printers equipped with an AMS or similar multi-material system.

For single-color printers, the model can easily be converted into multiple parts directly in your slicer, allowing you to customize the printing process.

• Material: Any

• Infill: Any

• Supports: Not required

• Multi-color printing: 3MF file included

• Single-color printing: Easily adaptable in your slicer

I'm also including the SVG file of the arrow for anyone who wants to customize the design or create their own variations.

Perfect for curious minds, science enthusiasts, classroom demonstrations, or simply challenging your friends and family!

Hope you find this model fun!
Please, share it if you print it!