Histograms are widely used to explore data, to present data, and to persuade with data. A method and system for identifying all possible histograms from a data sample using histogram appearances. The method and system includes determining all possible one dimensional histogram appearances for a transformed data sample using constant width intervals and for multidimensional appearances with data cell boundaries that are parallel as well as not parallel to data space axes together with multiple conditions on the interval widths for each dimension or transformed dimension.