> what is a metre? it's a measure that we convened around an ingot mold that the french used 200 years ago. the origin doesnt matter, we would always have to arbitrarily pick something. the point is that both systems derive from this very same convention, but imperial is derived from the way metric portions the original reference in a particular way.    mark 2 dots at 33,3 and 66,6cm and cut? > oh but it won't be perfectly accurate, some pieces are going to be larger than others neither will the carpenter who uses imperial units. you can't saw within a 10 micrometer margin of error without computer assistence.   because they grew up with imperial. people who grew up with metric can "feel" it just fine. but all of the calculations were done in metric.
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