Why is the Big 2 circle eyes and the square shaped mouth so popular in media? And what makes it so cute?

You may have been on the Internet for more than a decade, at one point you may have seen the infamous "O□O" face.

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This also appears in anime, manga and even webcomics aswell. Its nowhere annoying but for some odd reason I find it very cute regardless of where you put it on.

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What made it so good to the point its put on modern artwork and shown as a feeling of "cutie face go brrr :3"?

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I assume it could've originated in Japan because that's where most of the emoticons come from...