/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://studio.sketchpad.cc/sp/pad/view/ro.u8s-0QWSpub/rev.1124
 * 
 * authors: 
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 *   Brian Thomason
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 *   Daniele Olmisani
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 *   Paul Dougan
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 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



d=a=150;b=a*a;X draw(){for(i=0,d--;i--<b;){u=i%a/a-1;v=i/b-1;for(p=q=j=n=0;p*p+n<5&j++<a;){n=q*q;q=2*q*p+v;p=p*p-n+u}set(i%a,i/a,~j<<d)}}