Still:<p>The sea is a notoriously hostile environment for great apes such as us.<p>The sky is notoriously unattainable (we fly since, what, 2 centuries?)<p>Everywhere else, Blue is pretty uncommon On average, the wilderness is mostly shades of brown and green.  And what <i>is</i> blue tend to be pretty intense: flowers and venomous animals, mostly.<p>That said, I&#x27;ve read around here that colours are mostly a cultural thing (except maybe red).  So I&#x27;d wouldn&#x27;t put too much into it.  The interesting parts come later in the article anyway: how UI design could take inspiration from sci-fi, including its mistakes.