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It appears the little cute robot is inspired by bathroom signs.
Take a look at a normal bathroom sign you notice it has a couple things in common. Irina Blok was a designer at Google who headed the team who had to come up with a logo. Speaking to the new york times about how it came about.
You must login or register to view this content. you can read the interview in full here.
It's quite a good read!

That's Interesting...