It showed which houses were connected to the town's water supply and which houses were occupied by black or white families. A mashup uses data from more than one source, usually publicly available information, and almost always presents it on a map. The results were extraordinary: the map showed that almost all the white households in Coal Run had water piped to their homes, while all but a few black households did not. Those without piped water had to carry water home from the water plant by whatever transport they could muster, pump it from wells contaminated with sulphur and oil from old mining operations or, in extremis, collect rainwater.