These are motorized arrays that I designed to demonstrate the Rightward Pointing Arrow Illusion.

Highlight video that shows all of these arrays in action:

https://youtu.be/sF--cz88Yu8

Video that describes how I designed and built these arrays (will be useful for assembly):

https://youtu.be/elV34YB5k8k

This optical illusion was created by the amazing Kokichi Sugihara, a Japanese mathematician.  He has also created other well known illusions such as the “Ambiguous Garage Roof” and the popular “Ambiguous Cylinder Illusion”.  Please see video descriptions for more about him and for links to his work.

**Please note that the best way to show your appreciation and keep me designing stuff is to head over to my YouTube channel and subscribe**

https://www.youtube.com/potentprintables

This does require some additional items beyond 3D printed parts to function (servos, servo motor controller, etc.).  A full parts list is included with the STL files.

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STL quantities to print:

Rightward Pointing Arrow (see link below for STL)

https://www.thingiverse.com/thing:2887058

Base NxM {QTY 1}

Legs {QTY 4}

Motor Coupler {QTY = # of arrows}

Arrow Coupler {QTY = # of arrows)}

Special Assembly Instructions:

Trim one of the included servo motor horns, so that only the “hub” remains and it will fit into the Motor Coupler (see video for footage of a completed sub-assembly).  Use caution when doing this!
- Bond this hub into the Motor Coupler using epoxy.
- Bond the magnets into the Motor Coupler and the Arrow Coupler, such that the polarities are opposite and the two Couplers will stick together.
- Bond the Arrow Coupler into the Arrow itself.
- Bond the Legs onto the Base of your choice.
- Install the heat-set inserts into the base.
- Screw the servo motors into the base (you can also glue them in place if you don’t have heat-set inserts).
- Install motor coupler onto motor and then place Arrow onto motor coupler via magentic interface.
- Hook up electronics and make the arrow dance!

WARNING: Please be careful when following any of the instructions listed here.  Please wear and use the appropriate safety equipment.