Draw at random, varying stroke length by coordinates.

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Canvas.setpenopacity(1); const turtle = new Turtle(); let x, y; function walk(i) { x = -100+200*Math.random(); y = -100+200*Math.random(); turtle.penup(); turtle.goto(x,y); turtle.seth(Math.random()*360); turtle.pendown(); turtle.forward(2-0.25*Math.log2(Math.abs(x))-0.5*Math.log2(Math.abs(y))); return i < 200000; }