I gave a program to one of my weaving guilds about taking a four shaft overshot motif and weaving it on eight shafts. So thought I would share with you what I told them.
The idea is to have the four shaft motifs threaded on two independent sets of shafts, so the same pattern can be woven side by side. Now I didn't dream that up, I saw an article in the Summer 1997 Weaver's Magazine by Barbara Koch: Two For One. I did weave her draft.
As you can see here, the same 'motif' is on the bottom for shafts and the back four shafts. Now, see her tie up. I decided to see what would happen if I wove the bottom four shafts in Star fashion and the top four shafts in Rose fashion. Now look at the same threading with a different tie up.
Thinking my self very clever to tweak the tie up for this neat effect, I was reminded that any weaving we might do has been done before. While researching another overshot question, I found on page 311 of the book: Pattern Techniques for Handweavers by Doramay Keasby, the explanation of this very trick. But I did enjoy the chase to figure this out. (If you can find that book or magazine article, maybe you will try this too.)