The spatial representation of a problem is a key feature of reaction-diffusion processors. Data and results are represented through concentration profiles of the reagents or spatial configurations of activity patterns. A computation is defined in a physical space as well. The computation is realized by spreading and interacting waves of the reagents or excitation patterns. A computational code, or a program, is interpreted in a list of possible reactions between the diffusing components and in a form of diffusive or excitation coupling between microvolumes of the computing medium. Usually, such properties could not be changed online. But they can be determined and adjusted to work toward the solution of a particular problem. Therefore most reaction-diffusion processors are intentionally designed to solve a few particular problems—they are specialized. To give the reader a sense of these specialized processors in both automata and laboratory forms, the following sections will show designs of reaction-diffusion processors that subdivide a space and approximate a skeleton of a planar shape.
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