Balance

Is a picture hanged on the wall through a string always right ?
The ends of the string being symmetrically fixed on the picture, sliding without any friction on a nail on the wall.
In other words, are some pictures right only because of friction ?
Solution
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The floating cube

May a floating cube be 'sloped'. That is at a weird angle, neither 0, nor 45░ nor 54.7░
Solution
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