Good uses for Duplication and Mirror mode?

[KrappsLastBake]

I have bought the BCN3D Sigma R19 recently (https://robosavvy.com/store/bcn3d-sigma-r19.html) and I have been trying to find some novel and unique models to try out the Sigma's Duplication and Mirror modes. Has anyone out there had any experience with this and used it to their benefit? I am looking for ideas that aren't just "print the same model twice".