(I reckon, when they put up the Schoolroom board, they made a 200mm spacer. They put up the lowest rung and then rested the next rung on the spacer to fix it, instead of drawing a line and putting the top edge of the next rung on the line.
And thus, a new standard was born.)
The schools campus board was originally built in bens backyard and lived there for a year or so before the school was built. Back then we really were not that bothered with all the standardisation that people want so we just built it to some rough dimensions Ben had. We were not trying to exactly replicate the original.
The level of "thought" that went into these things and the school boards was pretty minimal.
And i still cant use the quote function on this site properly