t/go">Going to Work</a> (Figure 6)
  <li> <a href="nmct/lifting">Lifting the Ends of the Table</a> (Figure 7)
  <li> <a href="nmct/pendulum">Holding the Pendulum</a> (Figure 8)
  <li> <a href="nmct/publish">Publishing Papers</a> (Figure 9)
 </ul>
 <li> From the paper
 "<a href="http://www.cs.utexas.edu/users/vl/papers/zt.ps">Representing the
Zoo World and the Traffic World in the Language of the Causal Calculator</a>"
 by
<a href="http://www.cs.bilkent.edu.tr/~akman">Varol Akman</a>,
<a href="http://www.cs.