corridor

function setup() {
  var canvas = createCanvas(500, 500);
  canvas.parent('sketch');
  colorMode(HSB);
  rectMode(CENTER);
  background(98);

  stroke(15);
  line(width / 2, 4 * height / 10, width / 2, 6 * height / 10);

  for (var x = 0; x <= width; x += width / 20) {
    line(x, 0, width / 2, 4 * height / 10);
    line(x, height, width / 2, 6 * height / 10);
  }
}