Those are great insights, thanks for laying it out like that. This is also why rulers start with 0 (even if you can't see the 0) - because a ruler isn't about

Those are great insights, thanks for laying it out like that. This is also why rulers start with 0 (even if you can't see the 0) - because a ruler isn't about counting the marks, it's about measuring the space between the marks. There's an excellent discussion and illustration of this in the original Inside Macintosh - a few us us were kicking it around a couple of years ago here: https://news.ycombinator.com/item?id=6601515 https://news.ycombinator.com/item?id=6601515