In this case, the black bar is in memory of Marvin Minsky, the AI pioneer, who died on Sunday:<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10970867" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10970867</a>