There is a worldwide community of interactive artists who use OpenCV so that viewers can interact with their art in dynamic ways. The most commonly used routines for this application are face detection, optical flow, and tracking. We hope this book will enable artists to better understand and use OpenCV for their work, and we believe that the addition of better depth sensing will make interaction richer and more reliable. The focused effort on improving object recognition will allow different modes of interacting with art, because objects can then be used as modal controls. With the ability to capture 3D meshes, it may also be possible to "import" the viewer into the art and so allow the artist to gain a better feel for recognizing user action; this, in turn, could be used to enhance dynamic interaction. The needs and desires of the artistic community for using computer vision will receive enhanced priority in OpenCV's future.