One step in the soft concrete and the direction you turn from there will shape decades. You may find the very place, step there again, walk over it; turn again. It is the same pavement noticeably worn by micro erosion, cracked by the hard ice of twenty winters. The place is the same, the space is changedβ shaped as it is now by twenty years of urban development. Some buildings provide familiar shelter, others drip stormwater on your head from strange appendages. Stand there if you can spare a moment. Turn again. No pavement lasts forever; concrete is liquid and can take decades to dry.