1. A computer-based method to allow a user to analyze unstructured objects, comprising: allowing a user to select a plurality of unstructured objects, at least a portion organized into categories, as a corpus; allowing the user to select at least one concept to form a concept set; and displaying a first dimension including at least one of the categories, wherein for each concept in the concept set, a presence or absence of the concept is indicated for each category in the first dimension.