Why Google logo has 4 colors?

Why Google logo has 4 colors?

Colours of the logo are reminiscent of the first Google server built from Lego bricks. Google’s first server rack was built from Lego bricks, as the team considered it a more cost-efficient (and expandable) way to secure ten 4GB hard drives. The colours included in it were red, yellow, blue and green, same as the logo. Feb 20, 2016

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