There was a few articles about this exact issue on HN previously, a cursory search returns at least one of them:<p><a href="http:&#x2F;&#x2F;rocknrollnerd.github.io&#x2F;ml&#x2F;2015&#x2F;05&#x2F;27&#x2F;leopard-sofa.html" rel="nofollow">http:&#x2F;&#x2F;rocknrollnerd.github.io&#x2F;ml&#x2F;2015&#x2F;05&#x2F;27&#x2F;leopard-sofa.ht...</a>