The logic is sound in terms of accentuating a phenomenon, however the varying height of a volume histogram provides that information. Adding color to the histogram reinforces a particular data point at the expense of another. Volume is either incr or decr. The exception is when it is the same, which requires a context to determine if it's more like incr or more like decr. Yes, the price pane contains that info, and when someone's workspace is with the HRE, efficiency is key.
%% If you think about your last line [ ''only works....]; Gotcha, we Gotcha. I mean since no one can predict the market; + the past can repeat plenty, not exactly, but close enough to help . Not sure he meant ''to explain every move'' By the way; i doubt if he was against beginners completely, cause they are right some. LOL Thanks