Experimenting making hot air balloons out of metal rods, this is the first attempt, the idea is to use a loose fabric so it can drape well

Models of veins with metal rods

This is stitching on canvas fabric, represeting of lungs veins but in green colour to show health and nature, the idea is putting these fabrics(thiner fabrics which they drape well) on structures looking like hot air balloons to represents lungs.

Green Lung