Very interesting piece I picked up. It reminds of the fat lava pottery from the 60s and 70s. I couldn’t find a mark or signature. If someone made this as a hobby, then hopefully they made more. It is great to look at and admire. This is a somewhat heavy piece too. The inside has a gray almost concrete color, which leads me to believe it was made for art display only. Please look at the pictures. If anyone has any specifics to this art piece, let me know. I also have a vase that is made the same way. Thank you!