This sketch is created with an older version of Processing,
and doesn't work on browsers anymore.
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import processing.pdf.*;
void setup(){
size (800,800);
beginRecord (PDF, "lineas 2.pdf");
background (0);
}
void draw (){
for (int a= 10; a<= width; a+=50){
for (int b=10; b<=width; b+=50){
noFill();
stroke (random (55), random (155), random (155), 10);
beginShape();
curveVertex (a, 400);
curveVertex (b,400);
curveVertex (400, b);
curveVertex (400,a);
curveVertex (a,b);
curveVertex (b,b);
curveVertex (b,a);
curveVertex (b,b);
endShape();
}}
endRecord();
}