>> FWIW I think an equation for such an object might be:
>>
>> x^(1/w) + y^(1/w) + z^(1/w) < 1 and 0 < w <= 0.5
>>
> Ingenius! =)

Thinking about it, there should probably be a modulus function around 
x,y,z (to get the absolute value), otherwise x=-5,y=5,z=0,w=0.2 is part 
of the solid (which it shouldn't be).

> I will give that a try. I want to make an image that will depict how a 4
> dimensional object can look totally different depending on where it is
> sliced.

Slicing it along one of the coordinate axes will be easy, the hard (and 
more interesting) bit will be taking angled slices :-)

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