The author describes his development of a computerbased paper-marbling tool, based on a traditional Turkish art form in which marbled-paper Þgures and patterns are created on the surface of a liquid bath. Similar works can be obtained by simulating ßuid ßows on a computer, using the Navier- Stokes equations as the physical model of the ßuid ßows. The author has created an application program that includes marbling tools. Such a program must run in real time, so that hand-eye coordination is required of the user. Real-time simulation of ßuid ßows requires much processor power. The author has attempted to adapt this technique for use with a personal computer. To decrease the processing power required, the image size may be decreased, but the results may nnot be as satisfactory.