Pattern on tower

This is a redo using Relative Item (RelItem). It doesn’t look structurally sound to me, is this really what you want? (35.0 KB)

By the way, the spirals are interpolated curves (in version ‘a’ above) but could easily be polylines instead to match the faceted green and black triangular panels. See version ‘b’ below: (33.3 KB)

Creating duplicate threads is counter-productive: