Not only. In Italy there is a toy that explain the BCD (Binary coded decimal) with colored tiny balls. <a href="http:&#x2F;&#x2F;www.quercettistore.com&#x2F;prodotti&#x2F;rami" rel="nofollow">http:&#x2F;&#x2F;www.quercettistore.com&#x2F;prodotti&#x2F;rami</a> About 30 years ago.. Sorry but this not happen only in Silicon Valley.