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A shape transformation which reversed pillowing.
The inventor of this transformation wanted to try something new after pillowing some puzzles and came up with this.
The mechanism of a standard DIY would allow a bit of concavity by hand (with filling) but the challenge on the Inverted 3x3x3 was to go quite a bit deeper than a standard mechanism would allow.
A standard DIY-A has a 36 mm interior circle, but the distance between centers on the Inverted 3x3x3 is only 30 mm, which requires a completely different mechanism.
Not many have been made and thin parts mean they are fairly fragile. Both black and white have been made.
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
This puzzle can be found in collections of these members:
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