I know that the function below can probably be streamlined a tad,
but I'm not overly qualified in the math deprtment.  What's here is a
product of brain bashing experimentation and just a little inspiration
but I'm stuck.
    Could someone tell be how to add faces to this surface?
    And If there's a simpler way to define it?


A.D.B

function { (y+x&y+(-x))&y+z&y+(-z) }

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