Ergodic Oscillator from the book Momentum, Direction and Divergence by William Blau, implemented in the form of a color histogram with a signal line implemented as a colored cloud.

The indicator uses SmoothAlgorithms.mqh library classes (must be copied to the terminal_data_folder\MQL5\Include). The use of the classes was thoroughly described in the article "Averaging Price Series for Intermediate Calculations Without Using Additional Buffers".

Figure 1. Indicator BlauErgodic