svoid g22drawConnectingCurve(Graphics2D g, Pt start, Pt end) {
  var controlY = random(0, 40);

  var control = doublePt(avg(start.x, start.y), controlY);
  var path = new Path2D.Float;
  path.moveTo(start.x, start.y);
  path.quadTo(control.x, control.y, end.x, end.y);
  
  var color = oneOf(ll((Color.black), (Color.gray), (Color.red)));
  g.setColor(color);
  g.draw(path);
}