1. A computer implemented method of providing a histogram displaying one or more documents that a user has previously accessed comprising: receiving an input to perform a search query of an index, said search query including one or more keywords, and said index including said one or more documents the user has previously accessed; and presenting a histogram characterizing one or more documents matching said search query wherein said chronological histogram includes: a first axis providing a timeline for displaying a date when said one or more matching documents were accessed; and a second axis providing more than one variable characterizing said one or more matching documents.