Not Quilted lines, curl lines. Quilting is a different grain effect and rare in east coast maples. The big 3 in your area are Sugar, Red, and Silver maple. Each can often be told apart just by densities. Being your bowl has spalt, that changes lignin and makeup, which alters density. The 'W' on the bottom, is that your mark?Ah, Poplar! so thanks to you guys I discovered a new favorite wood, well, thanks to whatever tree service dropped this piece of “Rainbow Poplar” off in my driveway! I’d never seen this kind of wood before but gosh dang if it’s not the easiest wood I’ve ever turned with, and also pretty on the eyes! Poplars we’re always the trees that made me the most nervous to climb and remove, reminds me of asparagus, breaks in half wherever it feels like so it makes us climbers a bit puckered. Thanks Mike and Peet, I think you’re right about that being sugar maple, the quilted lines shoulda gave it away..