This is a fun project. Turning 2 bowls in one or a Bowl in a Bowl.
Another multi axis turning. Sort of an offset turning.
It is an illusion but I have already been asked if I glued the 2 together.
I show all the steps I did to create it. Any size is possible with only one dimension being somewhat critical for it to look good.
Careful setup and accurate cutting is required.
It is an advanced turning but it can be done. Turn to your abilities and be safe.
This has been done before. I saw an image of one done a few years ago. And I have been told there is a video done as well. I was also told it lacked explanation of how it is done.

Check out Gord Rock for great reviews and some fine wood turning as well.
Gord's channel
   / @gordonrock1  

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Look up other turnings I have done:
Dizzy Twister Turnings
Segmented Turnings
Pierre Lussier inspired vase
Mike Waldt inspired vase
Tumbling bowls
Emerging Bowls
Black Locust Vase
Droop Bowl
Offset Bowl
Barrel of Blocks
Star Bowl