I read this in a link to one of Susa Glenn's designs. She says for decorative designs that aren't going to be washed every week, Rayon is better not because of the shine, but because it has an actual nap. Thus, if you embroider in different directions, just like a material with nap, the light is going to catch it in different ways, making the design far more interesting. Aha!!! I was wondering why, with Floriani coming out with the shiny thread that art embroiderers like Susa Gelnn & BFC Creations would still prefer Rayon. This sheds a lot of light (pun intended) on the choice. Thread with nap would make a design far richer, and look different from every angle & change in lighting. And now you know!! Thanks, Susa Glenn!! Marji