Behold, the squircle-oid!
This is the shape defined by the equation
(x/2)⁴ + y⁴ + z⁴ ≤ 1
I made it as part of a set of props for explaining Lᵖ norms. p=2 gives an ellipsoid, and in the limit p → ∞ you get a cuboid.

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In reply to @christianp

it's available on thingiverse at thingiverse.com/thing:3866307

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In reply to @christianp

... I mean inequality, not equation. Don't @ me

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