Comb (or, conditional randomness)
The panels of this model rotate randomly about their axes, unless they fall within a certain distance of a rail. So as you move the rail across the surface, the panels are smoothed over.
Also, the surface can be distorted! Because we wanted to be able to manipulate its control points in Rhino (sliders can be so tiresome!), you’ll have to build the curves there. You can see where the end points for the rail fall… for best results, think about lofting a surface between those. You’ll need at least two to make a surface, but the more you make between these two, the more control points you can have.