A Cool guide to Cistercian Numerals
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What bugs me most is that because of their perfect symmetry, if you turn the paper around, the glyphs are still perfectly legible, just give you the wrong number.
I bet they scribbled these mostly on the walls of their cells in their Monastery. You'd have to hang upside down from your bunk to misread it.
In all seriousness, wait until you hear that they wrote these horizontally when combined with Latin script.