Not that long ago, the trading floor of the New York Stock Exchange was filled with business-tie clad gladiators, climbing over each other in what looked like a capitalism-induced mosh pit. The Open outcry pit had its language, its own weather, its own smell. Nowadays, these pits are more subdued. They still are populated with people, and some are gesturing to buy and sell, but most of the transactions are done digitally. It is this role where the computer has changed the way financial markets work; from the ground up.