Mathematics of Higher Order Twisty Puzzles (Rubik's Cubes)

Explaining why the 7x7 has to be curved instead of a cube.

Also, I know there has been a cubic 7x7 made by Etienne de Foras, however, his model caused the entire puzzle to bulge to allow turns, therefore making a functional, yet unstable puzzle.

Category:

Education

Tags:

• rubik
• cube
• puzzle
• twisty
• 7x7
• 6x6
• big
• cubes

[dantheman163]

you could make a cubic 7x7x7 just by buliding up the pillowed parts of the 7x7x7 until it is a cube. you can see how just by taking 6 pieces of card board and placing one on each side

[SympleSyn]

That wouldn't exactly be properly cubic. The outer pieces would be extremely rectangular.

[jibjunkie405]

Etienne de Foras made a fully cubic 7x7 fully functional one so it is very possible

[SympleSyn]

That is true, but if you looked at the mechanism, the whole puzzle flexed outward during a 45 degree turn. It was not stable at all.

[LanceTheBlueKnight]

It would be possible to extend all of the pieces so that it seems perfectly cubic, and all pieces are the same size. You would still have a pillowed 'core' though.

[SympleSyn]

Do a 45 degree turn then. Would they stay in?

[juanpjp27]

LMAO "and if you have some questions just post or some shit like that"

nice ending

[zackpots]

i feel smarter than i was 5 minutes and 5 seconds ago

[Jamiewinters8]

But when you take apart a 7x7 or even a 5x5,the actual edge pieces go very deep in, shouldn't that be enough to keep them in the puzzle?

[holdtheonionsplease]

i feel more stupid than i did 5 minutes and 5 seconds ago

[iasimp1997]

A tripod could help in this situation xD

[CuBeOrDiE]

I agree with you, but I think you could have made the video a little shorter and people would still get it. But it's very thorough, so good job on that!

[highlycomplex]

so what youre saying is that there are too many cubies in one layer of a 7x7

[CharlesOBlack]

Woah, I didn't know you were a lefty :P

[sharpnova2]

yes of course they would. since he's talking about a pillowed design. the v-cube 7 is pillowed and that's why it works.

ur math is correct, though for idiots out there it would make more sense if u just drew two overlapping squares offset by 45 degrees rather than the circle.

[hellzchozen]

To the people saying "you need to explain it more", all you need to do is read the description box to understand what he is talking about. Sorry for your lack of common sence.