A Beautiful Bug - OpenProcessing

mySketch
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/******************
Code by Vamoss
Original code link:
https://openprocessing.org/sketch/1116518
​
Author links:
http://vamoss.com.br
http://twitter.com/vamoss
http://github.com/vamoss
******************/
​
var positions = [];
const GRID_SIZE = 50;
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  background("#1a0633");
  
  colors = [color("#1a0633"), color("#1a0633"), color("#581845"), color("#900C3F"), color("#C70039"), color("#FF5733"), color("#FFC30F"), color("#581845")];
  
  for(var i = 0; i < colors.length/2; i++){
    var position = {
      current: {
        x: round(width / 2 / GRID_SIZE) * GRID_SIZE,
        y: round(height / 2 / GRID_SIZE) * GRID_SIZE
      },
      previous: {
        x: round(width / 2 / GRID_SIZE) * GRID_SIZE,
        y: round(height / 2 / GRID_SIZE) * GRID_SIZE
      }
    }
    positions.push(position);
  }
}
​
function draw() {
  positions.forEach((position, index) => {
    for(let i = 0; i < 3; i++){
      position.current.x += round(random(-1, 1)) * GRID_SIZE;
      position.current.y += round(random(-1, 1)) * GRID_SIZE;
      position.current.x = constrain(position.current.x, GRID_SIZE, round(width / GRID_SIZE) * GRID_SIZE - GRID_SIZE);
      position.current.y = constrain(position.current.y, GRID_SIZE, round(height / GRID_SIZE) * GRID_SIZE - GRID_SIZE);
​
      if(random() < 0.1){
        stroke(colors[(index*2+0)%colors.length]);
        strokeWeight(GRID_SIZE);
        line(position.current.x, position.current.y, position.previous.x, position.previous.y);
​
        stroke(colors[(index*2+1)%colors.length]);
        strokeWeight(2);
        line(position.current.x, position.current.y, position.previous.x, position.previous.y);
      }
      
      position.previous.x = position.current.x;
      position.previous.y = position.current.y; 
    }
  });
}