I thought centering was horrible in CSS until I tried it on my wall. At least CSS doesn't leave permanent holes in my housepic.twitter.com/yh0xGkpEZr
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A good Laser level is a great investment ... https://www.amazon.com/Semlos-Multipurpose-Measuring-Adjustable-Telescoping/dp/B071SHLJTH/ref=lp_11646386011_1_18?s=hi&ie=UTF8&qid=1502196058&sr=1-18 …
In an orthogonal home, sure. I have rooms so off kilter that anything level will look off :) Eyeballing is the only way.
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