I like a lot of the work that Penny does with getting regions and avatars scaled to realistic proportions. So, when I saw that she had released new shapes I wanted to check them out. She has a blog article about them here: More Vitruvian Shapes!
The picture is one she made to show the difference between the Linden Made Shapes and the to-scale-shapes she makes and recommends.
Her MP page links to her Second Life Camera Settings page. When using these shapes using her camera settings makes for an impressive change. I am so used to using the alternate camera settings for my defaults I am all OMG!, when a new install reverts them to system defaults.
Check them out and consider recommending them to new users.
If you are wondering about Vitruvian… The Vitruvian Man is a world-renowned drawing created by Leonardo da Vinci around the year 1487.