Sign of the times

A new mural is going up on the wall of a running-supplies store I pass on my way to work. It's going up very slowly, which may have something to do with the fact that it never stops raining omg. So for about a week there was only a parchment-looking background, and then for a while there were three pairs of roughly outlined running legs. Then some of the musculature was roughed in, and then running shorts were added (allowing us to tell that the runners were two men and one woman).

And then one day one of the legs had been painted out and a prosthesis had been added instead.