So I've spent some time adding more sample 3D faces. There are now more than fifty of them, and I've put up a separate "face bank" page for browsing them, http://www.relativitybook.com/CoolStuff/facebank.html . There's also some jerky video on the ErkDemon YouTube channel.
Some of the sharper-eyed visitors will have noticed that apart from Albert Einstein and Barack Obama, all the faces are female. Personal preference. I suppose that I really ought to grudgingly do a few more male faces at some point, just to make thing look more balanced. One or two. Maybe.
If anyone wants to leave any feedback or comments, you can do it here, on this blog page.
Now, see if you can work out which slider to move to make Barack Obama's ears waggle ...