If you are near/in Seattle and interested seeing the tree bark cup set live:

Josiane Keller “tree bark cups – set of four” stoneware, underglaze, glaze, dimensions: various, between 4.5” x 3” x 3.5”   (2019)

you can do so at KOBO Gallery Seattle at the 13th Simple Cup Show, opening Saturday Nov. 2nd:
https://koboseattle.com/blogs/news/13th-annual-simple-cup-show-november-2-2019

Cup by Carol Gouthro, Seattle, WA