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Magic

A Pen By Alex

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              <!-- Source: http://www.p01.org/128b_raytraced_checkboard/ -->
<strong>Oringinal source is <a href="http://www.p01.org/128b_raytraced_checkboard/">here</a> created by <a href="https://twitter.com/search?q=p01&src=typd">p01</a>.</strong> You can see my attempt at reverse engineering it <a href="https://www.alexkras.com/reverse-engineering-one-line-of-javascript/">here</a>.

<pre id=p><script>n=setInterval("for(n+=7,i=k,P='p.\\n';i-=1/k;P+=P[i%2?(i%2*j-j+n/k^j)&1:2])j=k/i;p.innerHTML=P",k=64)</script>
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