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    <meta content='Figure 19.21, The VRML 2.0 Sourcebook, Copyright [1997] By Andrea L. Ames, David R. Nadeau, and John L. Moreland' name='creator'/>
    <meta content='http://www.wiley.com/legacy/compbooks/vrml2sbk/ch19/19fig21.htm' name='reference'/>
    <meta content='Don Brutzman' name='translator'/>
    <meta content='4 September 2000' name='created'/>
    <meta content='25 March 2012' name='modified'/>
    <meta content='A square face and four normals. Also see Figures 19.21 and 19.22 for comparison.' name='description'/>
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