Two different helices can be assembled from rhombic icosahedra attached face to face. The default values of the controls produce a helix with small pitch. In this case the rhombic icosahedra are also aligned in five columns with connections at their tips. With a helix of rhombic rhombohedra the assembly becomes tubular. To produce the helix with large pitch, set the three controls (align, diameter, expand) all the way to the left.