Siamese Skewb HexsTwo Hex Skewbs (each with the shape of a Truncated Octahedron) fused into a single puzzle.
Siamese Void PentagonsSecond variant out of a series of Holey Megaminx transformations. This one has two twistable faces left.
SiamesillusionTwo 4x4x4's fused to imitate the Siamese Cubes, Tony earliest cube transformation.
SiaminxThe two Pyraminx share a single edge piece.
Siefert SurfacesThis cube is a Mathematical Art cube, showing six Siefert Surfaces.
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