Editing Professor's Cube (section)

==Workings==
[[File:Professors cube.jpg|thumb|left|Professor's Cube in scrambled state]]
[[File:Professor's cube solved.jpg|thumb|left|Professor's Cube in solved state]]
The original Professor's Cube design by Udo Krell works by using an expanded 3×3×3 cube as a mantle with the center edge pieces and corners sticking out from the spherical center of identical mechanism to the 3×3×3 cube. All non-central pieces have extensions that fit into slots on the outer pieces of the 3×3×3, which keeps them from falling out of the cube while making a turn. The fixed centers have two sections (one visible, one hidden) which can turn independently. This feature is unique to the original design.<ref name="Krell patent">[http://www.freepatentsonline.com/4600199.html United States Patent 4600199]</ref>

The Eastsheen version of the puzzle uses a different mechanism. The fixed centers hold the centers next to the central edges in place, which in turn hold the outer edges. The non-central edges hold the corners in place, and the internal sections of the corner pieces do not reach the center of the cube.<ref name="Eastsheen patent">[http://www.freepatentsonline.com/6129356.html United States Patent 6129356]</ref>

The V-Cube 5 mechanism, designed by Panagiotis Verdes, has elements in common with both. The corners reach to the center of the puzzle (like the original mechanism) and the center pieces hold the central edges in place (like the Eastsheen mechanism). The middle edges and center pieces adjacent to them make up the supporting frame and these have extensions which hold the rest of the pieces together. This allows smooth and fast rotation and created what was arguably the fastest and most durable version of the puzzle available at that time. Unlike the original 5×5×5 design, the V-Cube 5 mechanism was designed to allow [[speedcubing]].<ref name="Verdes patent">[http://www.freepatentsonline.com/y2007/0057455.html United States Patent 20070057455]</ref> Most current production 5×5×5 speed cubes have mechanisms based on Verdes' patent.
<gallery>
File:Professor's Cube disassembled.jpg|A disassembled Professor's Cube
File:V-Cube 5 disassembled.jpg|A disassembled V-Cube 5
File:Disassembled Eastsheen 5x5x5.jpg|A disassembled Eastsheen cube
</gallery>