Now that you've had some time to stare smugly down your nose at me, my point was that it was a testament to the expressiveness of Python, and the simplicity of the VM that that VM was a reasonable thing to write in 500 lines of python. I also noted that it's sligtly less impressive in light of how Scheme was able to do something similar, but in a significantly more compact manner, as the language was more flexable, and simpler.