If you don't see the polyhedra as 3D models, your computer is
not up-to-date in its software. In the future, all web
browsers are likely to come with the built-in ability to view
VRML files. For the present, because it is a new technology, it
is usually added in as a separate module. Fortunately, VRML
add-on software exists for all popular web browsers and computer
platforms. If you are viewing this on your own computer, you can
download and install the necessary software yourself for free.
If you are using a computer at a school, corporation, or other
organization, ask your system administrator to update the web
browser you are using. Point him or her to this page if
necessary. To find a VRML plug-in for your machine and
software, use this NIST VRML
detector page. One to try on a PC is Cortona.
I'm told this
works well on a Mac.
Most of my polyhedra files were written around 1995 according to the VRML 1.0 language specification, but some were written later with VRML 2.0. For some VRML browsers, only VRML 2.0 is installed by default and you have to get a special add on file which automatically converts version 1 files to version 2 when you view them.
After you get the software installed, you might want to check
out these VRML viewing tips.