function setup() {
  createCanvas(500, 500);
  background(250);
  drawBar(width / 2, height - 10, 100, PI / 2, 8);
}

function drawBar(x0, y0, length, theta, N) {
  if (N > 0) {
    let x = x0 + length * cos(theta);
    let y = y0 - length * sin(theta);
    line(x0, y0, x, y);
    drawBar(x, y, length * 0.8, theta + PI / 8, N - 1);
    drawBar(x, y, length * 0.8, theta - PI / 8, N - 1);
  }
}