Normally you need an even number of gears in a loop for them to work - unless it is in a Möbius band shape. Someone made a 3D printed Möbius band shaped loop of 15 gears - that actually works!
Here is a video of an odd number of gears working in an intertwined Möbius band:
Here is a video of an odd number of gears working in an intertwined Möbius band:
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