There are varieties of ways in which history can be organized, including chronologically, culturally, territorially, and thematically. These divisions are not mutually exclusive, and significant intersections are present. It is possible for historians to concern themselves with both the very specific and the very general, though the trend has been toward specialization. The area called Big History resists this specialization, and searches for universal patterns or trends. History has often been studied with some practical or theoretical aim, but may be studied out of simple intellectual curiosity.[31]