// hide and show controls
  public void hideControls() {

    if (keyPressed && (key == ' ')) {

      cp5.show();
      // stats and controls
      fill(0, 100);
      noStroke();
      rect(0, 0, 300, 300);

      fill(255);
      textSize(25);
      text("windSpeed: " + String.format("%.2f", wind), 10, 150);
      text("people: " + peopleLength, 10, 180);
      text("behaviors: " + physics.behaviors.size(), 10, 210);
      text("circles: " + circles.size(), 10, 240);
      text("framerate: " + frameRate, 10, 270);
    } else {
      cp5.hide();
    }
  }