In a book I'm reading, there is a nice 3d shape which the book says is the
result of the equation:

x^3 + y^3 = 1

However, it comments "x and y are regarded as complex variables".

What does a complex variable mean in this context and what would be the
iso-surface function for the above?

Many thanks in anticipation...

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"To stop children being afraid of the dark, try to fill their daylight hours
with as much terror as possible"
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