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A triangular prism with 2 layers and without corner pieces.
A puzzle which is easy like the 1x2x3. Instead of two outer columns it has three. Back in 1983 Tony Fisher mad a similar puzzle but never revealed it. Li Chung Man therefore was the first one (as far as we know) who presented one to the community.
Compared with the "Trigonal Domino" there are no corner pieces.
In 2002 a patent was granted to FRANCISCO GUITART CAMPS under the number given here. But this patent was never used to create an actual puzzle out of it.
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