Today, many computational techniques of form-finding use the term design with the term research. Thus, architectural studios become more and more like laboratories for design experiments. This study proposes a design experiment called "The Sound Motion Streaks Project" where the sound can be used as generative computational data and applied to digital form finding studies. Design process relies on an idea that sound as an external force can produce or deform shapes according to its influence. The first phase of the process is to make physical experiments on the sound and see its influences on granular and fluid materials. We can say that, in these physical experimentations, there is a knowledge transmission from physical to digital medium that we can use as design parameters on software. In digital software, the sound can be a force field and manipulate digital matters such as particles, curves and meshes. The form-finding method of the Sound Motion Project is constituted by all physical and digital experiments, and applied in an urban area in order to discuss its architectural potentials. For instance, all material events in the area depend on duration and movement of digital tools, thus the notion of form and/or space become kinetic. Kinetic reactions bring out a new understanding of space and form which consists of motionless boundary, translatability, rhythmicity, differentiated densities and heterogeneity. Also this generative approach gives architects many potential solutions for architectural forms.