: This is a position paper introducing blob computing: A Blob is a generic primitive used to structure a uniform computing substrate into an easier-to-program parallel virtual machine. We find inherent limitations in the main trend of today’s parallel computing, and propose an alternative unifiying model trying to combine both scalability and programmability. We seek to program a uniform computing medium such as fine grain 2D cellular automata, or more generally coarse grain 2D grids of Processing Elements, using two levels: In the first “system level”, a local rule or run time system is implemented on the computing medium. It can maintain global connected regions called blobs. Blobs can be encapsulated. A blob is similar to a deformable elastic membrane filled with a gas of atoms. (elementary empty blobs). Blobs are interconnected using channels, which act as a spring to bring connected blobs closer to each other. The system implements in a distributed way: movement, duplication...