In 1986 Peter Steidlmayer published Markets and Market Logic. In this book, he outlined a revolutionary way to represent price data. His method eliminated “time” from the graphical representation of price. He instigated the “Vertical Arrangement of Data” or VAD as a method of graphing price action.
This is a companion discussion topic for the original entry at https://www.optuma.com/kb/optuma/tools/statistical/market-profile