This wood comes from a huge poplar tree with the diameter of 120 cm. The cross section wood looked beautiful and when I was putting this little piece into the car it was already dark so I did not see the details of it. As I was preparing the wood for mounting on the lathe, it revealed that there were annual rings of a branch. See the photo. Poplar wood is soft wood so at hollowing I had a great aid of Brother System 2 from Hamlet Craft Tools. As you can see in the set of photos the shavings are 1 mm thick. The shade is 28 cm long and 27 with outer diameter. I put it into the shavings as usual. Now I will have about a year to think of what to do with it.