Wonderful stuff, aspen. Favored by the Finns for sauna (sow'-na) benches because it's splinter-free and always seems cooler than any other piece of wood inside the building. Favored for the floor of carts and stone boats because it dents when struck a blow rather than splitting.
Interlocked grain protects it from splitting, but there are many changes in direction to create "fuzzies" (or chatoyance) along the way. Couple this with the soft, long fibers that favor a Finn's bottom and you'll know that you really want to turn aspen dry, when it can't bend and flop so much.
Fortunately it's almost bulletproof in drying, along with the whole willow/poplar family. Hog it without regard to fuzzy in any way that removes wood, set aside to dry and sharpen your tools before you re-turn. It makes great translucent pieces if you stay sharp and get support from a steady. Oil soak and set the bowl on the table, where it gives a kaleidoscope of patterns as the sun swings from east through south in my dining room.