x*(.5-y/6)

You're on the right track with that. Try this:

x-y/6

and you'll find that you have a quadrilateral block. Now you just need to
mirror that across the center. One way to do this is:

abs(x)-y/6

which only works because the block starts off symmetrical. An alternative
option is:

x - sign(x)*y/6

where sign(x) is defined as (untested code):

#declare sign = function(x) {select(x,-1,1)}

 - Slime
 [ http://www.slimeland.com/ ]

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