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RotoPrism 2
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A modified shape with a lower-order slice pattern for the Fracture-6.

RotoPrism 2 is a new shape with a lower-order slice pattern for the Fracture-6 puzzle. The corners of the prism are equivalent to the face centers from Fracture-6, while the face centers of RotoPrism 2 have no equivalent on Fracture-6. RotoPrism 2 has a full Fracture-6 mechanism nested inside of the puzzle.

RotoPrism 2 has the unique property of being deeper than origin cut. The explanation is as follows: The three rotational axes are located on each "rectangular" face at the intersection of the two square pieces and the large curved triangle. In order to turn any one of the axes by 90 degrees without altering the plane of the other two axes, the opposite small edge of the puzzle must be held stationary. Therefore the non-moving part of the puzzle is the small set of edge pieces opposite the turning axis, meaning the bulk of the puzzle (origin point included) is rotating.

In May 2013 the designer presented another version of this puzzles: "RotoPrism 2VB". The "VB" in the name stands for "visual blocking".
He did this because the phantom axes that appear on the original RotoPrism 2 are now visually blocked, thus no longer appearing as phantom axes on RotoPrism 2VB. This makes the puzzle a bit less confusing to solve, and to mix up.
See image 5 for a comparison. Note how in this image the phantom axes that appear to be available to turn on RotoPrism 2 is visually blocked on the RotoPrism 2VB puzzle. The yellow/red/green slice looks like it should be able to turn on the first puzzle, but is clearly blocked from turning by the adjacent pieces on the second puzzle.
Height: 45 mm
Curved side length: 65 mm
Weight: 63 grams



Thank you to the following people for their assistance in helping collect the information on this page: David Pitcher, Lawrence Cuthbert.


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