I blame the Canadian Navy for trackballs every day. Funny looking things.
Bigger IS better though.
Show Image
(http://geekhack.org/attachment.php?attachmentid=2324&stc=1&d=1240420121)
I can see why you like this one. The question I have is this: is the 8 ball like a standard billiard ball? This looks like a great pointer to sit alongside my model M.
Take a look at this. It's the world's very first trackball, made with a bowling ball by Canadian scientists in the 1950's.
Show Image
(http://geekhack.org/attachment.php?attachmentid=2697&d=1245349848)
Ha! You can tell it was invented by Canadians because that's a 5-pin bowling ball. 5-pin bowling was also invented by Canadians. (and played mainly in Canada)
http://en.wikipedia.org/wiki/5-pin_bowling (http://en.wikipedia.org/wiki/5-pin_bowling)
(Wikipedia entry even shows the trackball)