Douglas butler uses Autograph to explore the geometry of calculus. In short, this is a “master class”. The learning and teaching of mathematics can be revolutionised with the creative use of dynamic software is an oft quoted mantra. Here, this mantra is exemplified through the documented experiences of using Autograph to enliven, to extend, and to foster the understanding of differentiation and integration. The process is explained in the text which will leave the reader wanting more. To forestall any associated frustration, the author provides a treasure trove of activities, preconstructed files, video clips, and comment on the ATM website. You will not be disappointed. (ERIC)