I will show some aspects related to type-setting mathematics, and provide a tour through the wonderful world of TEX. The TEX language, developed by Donald Knuth some twenty years ago, represents the state-of-the art in computer typesetting. I will show how TEX works and give a variety of examples of what TEX and its derivative LATEX can do. The presentation will assume no familiarity with TEX. In addition to elementary examples I will demonstrate some advanced features and show some of the latest applications of TEX, such as creating interactive documents for the world wide web and making colorful slides for presentations.