The ruler or straight edge is an essential tool to sacred geometry, the possibilities are limitless with a compass and straight edge as to what you can create. A metal ruler is a good thing to have because plastic ones can get melted or nicked up. It's also important to have a ruler long enough for whatever you might be doing. My ruler also has a cork underside which I think is supposed to keep ink from spearing if you use it on a pen.
I nearly forgot, aluminum rulers can leave lines on your paper (from the metal, not from what you wanted to do) so it's good to have a stainless steel ruler.
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