This is all very impressive, indeed. I was wondering if Racket could be used to create a new sort of GIS app, i.e., geographic information system. It would have to do "vector graphics," which is to say every primitive drawing object is real, i.e., isn't just a setup step toward creating a raster bit map -- to be thrown away afterwards. For example, if you use a square object to represent a building, then that object should persist as something real, to which various attributes can then be attached, furthermore, to be part of a graph database. On the UI side, the objects should be "clickable," i.e., an actual object should be addressed. The bitmap idea of clicking on a spot -- connecting spot with coordinates, then with other data -- won't do.
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