let height = 400

let margin = 50

​

let numRows = 10

let numCols = 10

​

let squareLength = (width -2 * margin) / numCols

let maxShift = squareLength /6

​

function setup() {

  createCanvas(400, 400);

  frameRate(1);

}

​

function draw() {

  background(220);

  noFill();

  for (let row = 0; row < numRows; row += 1) {

    drawRow(row);

  }

}

​

​

function drawRow(row) {

  for (let column = 0; column < numCols; column += 1) {

    let x = margin + column*squareLength + random(maxShift)

    let y = margin + row*squareLength + random(maxShift)

    rect(x,y, squareLength, squareLength);

  }

}