Draw a circle on your page. Now, turn that circle into the gourd that you selected.
Imagine a larger circle. A circle that surrounds your page. Now, turn that circle into the gourd that you selected. The stepping up of scale made you focus on a different level of detail, and as a result, a different set of lines. You can see a similarity but the shift is evident.
A few gourds fell and were broken so I changed the subject of the sketches but continued with the same exercise.
With this change of scale, more of shift can be seem than in the previous gourd.
The final one from this series was an investigation of my own. I was interested in the interior of the gourd and what make the ridges so pronounced on some. We cut one open to see what was going on. I drew the plan and elevation as a study of that.