Although the system has a restricted input-output (I/O) flow from the outside, the internal flow is a bit more flexible. There is still a rigidity to it but it is not as one-dimensional. To help explain, please consider the image below.
How this works is `GridPainter` receives input, usually a record type from `Domain`. From there, `GridPainter` utilises the various functions from the other files to complete the task it received. Because everything runs through`GridPainter`, it doubles up as the libraries co-ordinator. There is (for lack of a better word) no cross-pollination of function calls between the other files.
