See also some discussion here: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=9052375" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=9052375</a><p>From this source: <a href="http:&#x2F;&#x2F;www.amasci.com&#x2F;amateur&#x2F;holo1.html" rel="nofollow">http:&#x2F;&#x2F;www.amasci.com&#x2F;amateur&#x2F;holo1.html</a>