It isn&#x27;t an illusion. That&#x27;s what a truly random distribution looks like. There are techniques for producing a more even spread, nicely explained by Mike Bostock in the first part of <a href="http:&#x2F;&#x2F;bost.ocks.org&#x2F;mike&#x2F;algorithms&#x2F;" rel="nofollow">http:&#x2F;&#x2F;bost.ocks.org&#x2F;mike&#x2F;algorithms&#x2F;</a>