Understanding Media: The Extensions of Man

by Marshall McLuhan

Wayne and Shuster, the comedian team, never fail to get a good laugh when they line up a group of ancient Roman cops in togas and have them number themselves from left to right, uttering Roman numerals. This joke demonstrates how the pressure of numbers caused men to seek ever more streamlined methods of numeration. Before the advent of ordinal, successive, or positional numbers, rulers had to count large bodies of soldiery by displacement methods. Sometimes they were herded by groups into spaces of approximately known area. The method of having them march in file and of dropping pebbles into containers was another method not unrelated to the abacus and the counting board. Eventually the method of the counting board gave rise to the great discovery of the principle of position in the early centuries of our era. By simply putting 3 and 4 and 2 in position on the board, one after another, it was possible to step up the speed and potential of calculation fantastically. The discovery of calculation by positional numbers rather than by merely additive numbers led, also, to the discovery of zero. Mere positions for 3 and 2 on the board created ambiguities about whether the number was 32 or 302. The need was to have a sign for the gaps between numbers. It was not till the thirteenth century that sifr, the Arab word for “gap” or “empty,” was Latinized and added to our culture as “cipher” (ziphrium) and finally became the Italian zero. Zero really meant a positional gap. It did not...