The columns will turn green when the bulls are in control, i.e. when we have:
While on the other hand, the columns will turn red when bears are in control, i.e. when we have:
When neither bears nor bulls are in control, the column will turn Blue.
This happens during consolidation or minor pullbacks.
** To add on, each column represents the for the particular candle. The orange line across it is the (20) of the .