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A 7x7x7 truncated into the shape of a barrel, aka pillowed cylinder.
This is the first documented 7x7x7 transformation. No extensions were used, only truncations. Because of the pillowing on the 7x7x7 it came out more barrel shaped.
10 colours were used. They are orange opposite red on top and bottom, then going around the middle in columns are blue, brown, yellow, purple, green, pink, black, and turquoise. It moves as well as the puzzle it was made from and I am very happy with it.
All non-extended barrels and balls higher than 4 have unproportional curved pieces. It happens because starting from 5 it requires cutting more than 1 layer down. In case of this 7x7x7 barrel, building it from a pillowed 7x7x7 gives less curvy pieces than the other one made from the cubic one. To avoid curved pieces each of 25 centers on all 4 sides has to be extended, which leaves the proportional version of a barrel.
Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann, Lawrence Cuthbert.
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