The phrase "It's all Greek to me" dates back to scribes writing in Latin, and said scribe might come across some non-Latin text. Then he would note "Graecum est; non legitur" because anything scholarly that wasn't in Latin was assumed to be Greek. By the time Shakespeare wrote Julius Caesar it was pretty well known, but his usage cemented it into English usage so much that using grey bars to signify lines of text is called "greeking" by graphic designers.
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The phrase "It's all Greek to me" dates back to scribes writing in Latin, and said scribe might come across some non-Latin text. Then he would note "Graecum est; non legitur" because anything scholarly that wasn't in Latin was assumed to be Greek. By the time Shakespeare wrote Julius Caesar it was pretty well known, but his usage cemented it into English usage so much that using grey bars to signify lines of text is called "greeking" by graphic designers.