Horizon charts are one of the most complex charts to create and interpret. They provide an overview of positive and negative values or values above and below a threshold/target, and separately visualize dense and confusing datasets. As each category is shown in separate ranges, horizon charts may be the best solution for visualizing many time-series data sets that vary between positive and negative. Values of dark-colored areas are given by placing them on top of light-colored areas at the same time point. Negative values are represented by color rather than being positioned downward.