I got a commision to make a pair of goblets with celtic knots. They wanted them to match but to have the woods reversed in the goblet and knots. Man, making two things the same is really hard to do in my opinion. I turned one (the walnut one) and then tried to turn the second as close as I could. The diameters and other measurements were really close but the shapes just weren't the same. Standing alone they both turned out pretty good but side by side the differences are glaring in my eyes. I sent them this picture but haven't heard back yet. I don't think I'm ready to quit my day job.
They're Walnut with Ash knot and Ash with Walunt knot and just over 6" tall by 2" diameter.