Motorized sausage

OK, here comes another one!

<http://www.youtube.com/watch?v=V_fCznm3JF8>

<http://www.brickshelf.com/cgi-bin/gallery.cgi?f=231993>

This has a new (?) method of locomotion - it rolls along just by changing its
shape.  The wheels are fixed to the body and do not rotate.  In principle you
could enclose the whole thing in a plastic bag and it would still go (perhaps
there is a practical application there?).  Interestingly, it (usually) needs a
push to get started.

Essentially, the whole thing is like a giant universal joint:
<<http://media.peeron.com/ldraw/images/7/3712c01.png>>

It owes its existence to these two parts:
<<http://img.lugnet.com/ld/32016.gif>>
<<http://img.lugnet.com/ld/32324.gif>>

Enjoy!  Alexander