1 | initial version |

This is not really a Sage question, rather a mathematical question. What you are drawing is the unit ball of the L1 norm, which is an ocatagon. If you want to obtain a cube, you should rather draw the unit ball of the L-infinity norm. This norm does not sum the absolute values of the coordinates, but it takes their maximum.

Note that the maximum for symbolic expression, is `max_symbolic`

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2 | No.2 Revision |

This is not really a Sage question, rather a mathematical question. What you are drawing is the unit ball of the L1 norm, which is an ~~ocatagon. ~~ocatahedron. If you want to obtain a cube, you should rather draw the unit ball of the L-infinity norm. This norm does not sum the absolute values of the coordinates, but it takes their maximum.

Note that the maximum for symbolic expression, is `max_symbolic`

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