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Initially it sounds radical, but it has or had many possibilities. 

His concept looked at the very root of ground transport, all you really need is a simple system to govern the path of the moving object while minimizing the complexity of the moving object. 

Essentially it was based on a marble rolling along in a cute.   

The only two questions I have are - How often would the "balls" need to be replaced due to wear and at what expense? 

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