A story of a non-Jew who came to Shammai: he said, "Convert me on the condition that you teach me all of the Torah while I stand on one foot." Shammai pushed him away with the wood that was in his hand. The same man came before Hillel who converted him and said, "What is hateful to you, do not do to your neighbor. This is the entire Torah. All the rest is commentary. GO and LEARN it."
This Midrash, from the Babylonian Talmud, Shabbat 31b, touches on many issues. It is used to demonstrate the differences between Hillel and Shammai, the pair of sages credited as fathers of the rabbinic movement. It reminds us that grasping Judaism is not a simple task. Arguably, the Midrash reveals the simple principle to which Judaism can be boiled down - or it might raise the question, "Is it possible to boil it down at all?" In colloquial speech, "al regel ahat" "on one foot" comes to mean anything you have to say or do "on the fly" until you can get to it in greater depth, later. Because we use words and movement together, Moving Torah, can play with many of these meanings simultaneously (and sometimes -- quite literally)!