James T. Todd.
 <b>The Visual Perception of 3D Shape</b>.
 <em>Trends in cognitive Sciences</em>, 8(3):115--121, March 2004.
  <a href="http://vis.cs.brown.edu/docs/pdf/bib/g/Todd-2004-VP3.pdf.html">(pdf)</a>
  <a href="http://vis.cs.brown.edu/results/bibtex/Todd-2004-VP3.bib">(bibtex:
  Todd-2004-VP3)</a>.