Fa3ien wrote:

>> I was thinking more that the *stairs* are made of concrete...
> 
> Concrete stairs are usually build in a workshop, poured into
> a plywood form, upside-down (so the walking surface is at
> the bottom of the form, giving a mostly perfect look and
> dimensioning to the visible parts).

Really? I assumed they made them on-site. (And that that was the 
principle advantage of making stairs out of such an otherwise 
unattractive material when numerious better alternatives exist.)

Oh well, you learn something every day. ;-)

(Did you know, Boron is what makes silly putty so weird?)

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