Or when is a foot a foot?
https://www.nytimes.com/2020/08/18/s...gy-dennis.html
I was actually aware of this, having worked with Civil Engineers and surveyors and large projects. Just like in quilts, little hair splitting errors make a big difference eventually.
I also dutifully learned how to go metric back in 7th grade. 50 years later I'm still waiting... but not in quilts! No offense to our metric quilters but I'm going to stick to a 1/4" seam allowance
