I was just playing around with the Spirograph Effect, made a neat thing and added some color to it. Now I need to move the Stroke from the root layer to another layer. But as soon as I move it, it disappears. I notice that the root layer appears in the dropdown layer list at the bottom of the window, but not in the Layers dialog. Other than that, I really don't understand exactly what the root layer is.
Can someone explain what the root layer is, and why it doesn't appear in the Layers dialog? And why does the Stroke disappear when I try to move it out of the root layer?
Thanks for your help

(PS -- I looked in the Guide and the Manual, but didn't find anything about the root layer.)