13sep11 So vpy-lorenz.py here is straight VPython "lorenz.py". And python2.4 seems to have a visual attached to it. But "python2.4 vpy-lorenz.py" screws up the mouse on my mac and I had a dickens of a time .... had to kill the X-server! Worked the second time, though .... so the connection is OK and the above was a fluke. In l.py we make some stylistic changes, and increase the length of to reveal the characteristic shape of the Lorenz Attractor.