the heights of the tubes are driven by the three points hovering next to the framework. these are each given z values as a random number between 50 and 500. The distance of arc opening of the framework is also given a random value between 550 and 1000 (the limits I found that allow it to continue working). The tubes are then colorized based on a rule of the avg circumference of their opening. The initial sketch spline can also be moved to change the aggregate plan/perimeter of the tubes.