Есть такая прикольная штука у строителей — уровень. Их много всяких, конечно, даже лазерные бывают, как у джедаев, но меня всегда завораживал своей простотой пузырьковый. Стеклянный глазок, в нём цветная жидкость и пузырёк воздуха.
http://blog.fontanka.ru/posts/180205/
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